/* SpryCollapsiblePanel.js - Revision: Spry Preview Release 1.4 */

// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.CollapsiblePanel = function(element, opts)
{
	this.init(element);

	Spry.Widget.CollapsiblePanel.setOptions(this, opts);

	this.attachBehaviors();
};

Spry.Widget.CollapsiblePanel.prototype.init = function(element)
{
	this.element = this.getElement(element);
	this.focusElement = null;
	this.hoverClass = "CollapsiblePanelTabHover";
	this.openClass = "CollapsiblePanelOpen";
	this.closedClass = "CollapsiblePanelClosed";
	this.focusedClass = "CollapsiblePanelFocused";
	this.enableAnimation = true;
	this.enableKeyboardNavigation = true;
	this.animator = null;
	this.hasFocus = false;
	this.contentIsOpen = true;
};

Spry.Widget.CollapsiblePanel.prototype.getElement = function(ele)
{
	if (ele && typeof ele == "string")
		return document.getElementById(ele);
	return ele;
};

Spry.Widget.CollapsiblePanel.prototype.addClassName = function(ele, className)
{
	if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
		return;
	ele.className += (ele.className ? " " : "") + className;
};

Spry.Widget.CollapsiblePanel.prototype.removeClassName = function(ele, className)
{
	if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
		return;
	ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
};

Spry.Widget.CollapsiblePanel.prototype.hasClassName = function(ele, className)
{
	if (!ele || !className || !ele.className || ele.className.search(new RegExp("\\b" + className + "\\b")) == -1)
		return false;
	return true;
};

Spry.Widget.CollapsiblePanel.prototype.setDisplay = function(ele, display)
{
	if( ele )
		ele.style.display = display;
};

Spry.Widget.CollapsiblePanel.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
{
	if (!optionsObj)
		return;
	for (var optionName in optionsObj)
	{
		if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
			continue;
		obj[optionName] = optionsObj[optionName];
	}
};

Spry.Widget.CollapsiblePanel.prototype.onTabMouseOver = function()
{
	this.addClassName(this.getTab(), this.hoverClass);
};

Spry.Widget.CollapsiblePanel.prototype.onTabMouseOut = function()
{
	this.removeClassName(this.getTab(), this.hoverClass);
};

Spry.Widget.CollapsiblePanel.prototype.open = function()
{
	this.contentIsOpen = true;
	if (this.enableAnimation)
	{
		if (this.animator)
			this.animator.stop();
		this.animator = new Spry.Widget.CollapsiblePanel.PanelAnimator(this, true);
		this.animator.start();
	}
	else
		this.setDisplay(this.getContent(), "block");

	this.removeClassName(this.element, this.closedClass);
	this.addClassName(this.element, this.openClass);
};

Spry.Widget.CollapsiblePanel.prototype.close = function()
{
	this.contentIsOpen = false;
	if (this.enableAnimation)
	{
		if (this.animator)
			this.animator.stop();
		this.animator = new Spry.Widget.CollapsiblePanel.PanelAnimator(this, false);
		this.animator.start();
	}
	else
		this.setDisplay(this.getContent(), "none");

	this.removeClassName(this.element, this.openClass);
	this.addClassName(this.element, this.closedClass);
};

Spry.Widget.CollapsiblePanel.prototype.onTabClick = function()
{
	if (this.isOpen())
		this.close();
	else
		this.open();
	this.focus();
};

Spry.Widget.CollapsiblePanel.prototype.onFocus = function(e)
{
	this.hasFocus = true;
	this.addClassName(this.element, this.focusedClass);
};

Spry.Widget.CollapsiblePanel.prototype.onBlur = function(e)
{
	this.hasFocus = false;
	this.removeClassName(this.element, this.focusedClass);
};

Spry.Widget.CollapsiblePanel.ENTER_KEY = 13;
Spry.Widget.CollapsiblePanel.SPACE_KEY = 32;

Spry.Widget.CollapsiblePanel.prototype.onKeyDown = function(e)
{
	var key = e.keyCode;
	if (!this.hasFocus || (key != Spry.Widget.CollapsiblePanel.ENTER_KEY && key != Spry.Widget.CollapsiblePanel.SPACE_KEY))
		return true;
	
	if (this.isOpen())
		this.close();
	else
		this.open();

	if (e.stopPropagation)
		e.stopPropagation();
	if (e.preventDefault)
		e.preventDefault();

	return false;
};

Spry.Widget.CollapsiblePanel.prototype.attachPanelHandlers = function()
{
	var tab = this.getTab();
	if (!tab)
		return;

	var self = this;
	Spry.Widget.CollapsiblePanel.addEventListener(tab, "click", function(e) { return self.onTabClick(); }, false);
	Spry.Widget.CollapsiblePanel.addEventListener(tab, "mouseover", function(e) { return self.onTabMouseOver(); }, true);
	Spry.Widget.CollapsiblePanel.addEventListener(tab, "mouseout", function(e) { return self.onTabMouseOut(); }, true);

	if (this.enableKeyboardNavigation)
	{
		// XXX: IE doesn't allow the setting of tabindex dynamically. This means we can't
		// rely on adding the tabindex attribute if it is missing to enable keyboard navigation
		// by default.

		// Find the first element within the tab container that has a tabindex or the first
		// anchor tag.
		
		var tabIndexEle = null;
		var tabAnchorEle = null;

		this.preorderTraversal(tab, function(node) {
			if (node.nodeType == 1 /* NODE.ELEMENT_NODE */)
			{
				var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
				if (tabIndexAttr)
				{
					tabIndexEle = node;
					return true;
				}
				if (!tabAnchorEle && node.nodeName.toLowerCase() == "a")
					tabAnchorEle = node;
			}
			return false;
		});

		if (tabIndexEle)
			this.focusElement = tabIndexEle;
		else if (tabAnchorEle)
			this.focusElement = tabAnchorEle;

		if (this.focusElement)
		{
			Spry.Widget.CollapsiblePanel.addEventListener(this.focusElement, "focus", function(e) { return self.onFocus(e); }, false);
			Spry.Widget.CollapsiblePanel.addEventListener(this.focusElement, "blur", function(e) { return self.onBlur(e); }, false);
			Spry.Widget.CollapsiblePanel.addEventListener(this.focusElement, "keydown", function(e) { return self.onKeyDown(e); }, false);
		}
	}
};

Spry.Widget.CollapsiblePanel.addEventListener = function(element, eventType, handler, capture)
{
	try
	{
		if (element.addEventListener)
			element.addEventListener(eventType, handler, capture);
		else if (element.attachEvent)
			element.attachEvent("on" + eventType, handler);
	}
	catch (e) {}
};

Spry.Widget.CollapsiblePanel.prototype.preorderTraversal = function(root, func)
{
	var stopTraversal = false;
	if (root)
	{
		stopTraversal = func(root);
		if (root.hasChildNodes())
		{
			var child = root.firstChild;
			while (!stopTraversal && child)
			{
				stopTraversal = this.preorderTraversal(child, func);
				try { child = child.nextSibling; } catch (e) { child = null; }
			}
		}
	}
	return stopTraversal;
};

Spry.Widget.CollapsiblePanel.prototype.attachBehaviors = function()
{
	var panel = this.element;
	var tab = this.getTab();
	var content = this.getContent();

	if (this.contentIsOpen || this.hasClassName(panel, this.openClass))
	{
		this.removeClassName(panel, this.closedClass);
		this.setDisplay(content, "block");
		this.contentIsOpen = true;
	}
	else
	{
		this.removeClassName(panel, this.openClass);
		this.addClassName(panel, this.closedClass);
		this.setDisplay(content, "none");
		this.contentIsOpen = false;
	}

	this.attachPanelHandlers();
};

Spry.Widget.CollapsiblePanel.prototype.getTab = function()
{
	return this.getElementChildren(this.element)[0];
};

Spry.Widget.CollapsiblePanel.prototype.getContent = function()
{
	return this.getElementChildren(this.element)[1];
};

Spry.Widget.CollapsiblePanel.prototype.isOpen = function()
{
	return this.contentIsOpen;
};

Spry.Widget.CollapsiblePanel.prototype.getElementChildren = function(element)
{
	var children = [];
	var child = element.firstChild;
	while (child)
	{
		if (child.nodeType == 1 /* Node.ELEMENT_NODE */)
			children.push(child);
		child = child.nextSibling;
	}
	return children;
};

Spry.Widget.CollapsiblePanel.prototype.focus = function()
{
	if (this.focusElement && this.focusElement.focus)
		this.focusElement.focus();
};

/////////////////////////////////////////////////////

Spry.Widget.CollapsiblePanel.PanelAnimator = function(panel, doOpen, opts)
{
	this.timer = null;
	this.interval = 0;
	this.stepCount = 0;

	this.fps = 0;
	this.steps = 10;
	this.duration = 500;
	this.onComplete = null;

	this.panel = panel;
	this.content = panel.getContent();
	this.panelData = [];
	this.doOpen = doOpen;

	Spry.Widget.CollapsiblePanel.setOptions(this, opts);


	// If caller specified speed in terms of frames per second,
	// convert them into steps.

	if (this.fps > 0)
	{
		this.interval = Math.floor(1000 / this.fps);
		this.steps = parseInt((this.duration + (this.interval - 1)) / this.interval);
	}
	else if (this.steps > 0)
		this.interval = this.duration / this.steps;

	var c = this.content;

	var curHeight = c.offsetHeight ? c.offsetHeight : 0;
	
	if (doOpen && c.style.display == "none")
		this.fromHeight = 0;
	else
		this.fromHeight = curHeight;

	if (!doOpen)
		this.toHeight = 0;
	else
	{
		if (c.style.display == "none")
		{
			// The content area is not displayed so in order to calculate the extent
			// of the content inside it, we have to set its display to block.

			c.style.visibility = "hidden";
			c.style.display = "block";
		}

		// Unfortunately in Mozilla/Firefox, fetching the offsetHeight seems to cause
		// the browser to synchronously re-layout and re-display content on the page,
		// so we see a brief flash of content that is *after* the panel being positioned
		// where it should when the panel is fully expanded. To get around this, we
		// temporarily position the content area of the panel absolutely off-screen.
		// This has the effect of taking the content out-of-flow, so nothing shifts around.

		// var oldPos = c.style.position;
		// var oldLeft = c.style.left;
		// c.style.position = "absolute";
		// c.style.left = "-2000em";

		// Clear the height property so we can calculate
		// the full height of the content we are going to show.
		c.style.height = "";
		this.toHeight = c.offsetHeight;

		// Now restore the position and offset to what it was!
		// c.style.position = oldPos;
		// c.style.left = oldLeft;
	}

	this.increment = (this.toHeight - this.fromHeight) / this.steps;
	this.overflow = c.style.overflow;

	c.style.height = this.fromHeight + "px";
	c.style.visibility = "visible";
	c.style.overflow = "hidden";
	c.style.display = "block";
};

Spry.Widget.CollapsiblePanel.PanelAnimator.prototype.start = function()
{
	var self = this;
	this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

Spry.Widget.CollapsiblePanel.PanelAnimator.prototype.stop = function()
{
	if (this.timer)
	{
		clearTimeout(this.timer);

		// If we're killing the timer, restore the overflow
		// properties on the panels we were animating!

		if (this.stepCount < this.steps)
			this.content.style.overflow = this.overflow;
	}

	this.timer = null;
};

Spry.Widget.CollapsiblePanel.PanelAnimator.prototype.stepAnimation = function()
{
	++this.stepCount;

	this.animate();

	if (this.stepCount < this.steps)
		this.start();
	else if (this.onComplete)
		this.onComplete();
};

Spry.Widget.CollapsiblePanel.PanelAnimator.prototype.animate = function()
{
	if (this.stepCount >= this.steps)
	{
		if (!this.doOpen)
			this.content.style.display = "none";
		this.content.style.overflow = this.overflow;
		this.content.style.height = this.toHeight + "px";
	}
	else
	{
		this.fromHeight += this.increment;
		this.content.style.height = this.fromHeight + "px";
	}
};



/*
   DHTML PNG Snowstorm! OO-style Jascript-based Snow effect
   --------------------------------------------------------
   Version 1.2.20041121a
   Dependencies: GIF/PNG images (0 through 4.gif/png)
   Code by Scott Schiller - www.schillmania.com
   --------------------------------------------------------
   Description:
  
   Initializes after body onload() by default (via addEventHandler() call at bottom.)
  
   Properties:
  
   usePNG
   ---------------
   Enables PNG images if supported ("false" disables all PNG usage)
  
   flakeTypes
   ---------------
   Sets the range of flake images to use (eg. a value of 5
   will use images ranging from 0.png to 4.png.)
  
   flakesMax
   ---------------
   Sets the maximum number of snowflakes that can exist on
   the screen at any given time.
   
   flakesMaxActive
   ---------------
   Sets the limit of "falling" snowflakes (ie. moving, thus
   considered to be "active".)
  
   vMax
   ---------------
   Defines the maximum X and Y velocities for the storm.
   A range up to this value is selected at random.
  
   flakeWidth
   ---------------
   The width (in pixels) of each snowflake image.
  
   flakeHeight
   ---------------
   Height (pixels) of each snowflake image.
   
   flakeBottom
   ---------------
   Limits the "bottom" coordinate of the snow.
  
   snowCollect
   ---------------
   Enables snow to pile up (slowly) at bottom of window.
   Can be very CPU/resource-intensive over time.

*/

var snowStorm = null;

function SnowStorm() {
  var s = this;
  var storm = this;
  this.timers = [];
  this.flakes = [];
  this.disabled = false;
  this.terrain = [];

  // User-configurable variables
  // ---------------------------

  var usePNG = true;
  var imagePath = 'image/snow/'; // relative path to snow images
  var flakeTypes = 6;
  var flakesMax = 128;
  var flakesMaxActive = 64;
  var vMax = 3;
  var flakeWidth = 7;
  var flakeHeight = 7;
  var flakeBottom = null; // Integer for fixed bottom, 0 or null for "full-screen" snow effect
  var snowCollect = true;
  var showStatus = true;

  // --- End of user section ---

  var isIE = (navigator.appName.toLowerCase().indexOf('internet explorer')+1);
  var isWin9X = (navigator.appVersion.toLowerCase().indexOf('windows 98')+1);
  var isOpera = (navigator.userAgent.toLowerCase().indexOf('opera ')+1 || navigator.userAgent.toLowerCase().indexOf('opera/')+1);
  if (isOpera) isIE = false; // Opera (which is sneaky, pretending to be IE by default)
  var screenX = null;
  var screenY = null;
  var scrollY = null;
  var vRndX = null;
  var vRndY = null;

  function rnd(n,min) {
    if (isNaN(min)) min = 0;
    return (Math.random()*n)+min;
  }

  this.randomizeWind = function() {
    vRndX = plusMinus(rnd(vMax,0.2));
    vRndY = rnd(vMax,0.2);
    if (this.flakes) {
      for (var i=0; i<this.flakes.length; i++) {
        if (this.flakes[i].active) this.flakes[i].setVelocities();
      }
    }
  }

  function plusMinus(n) {
    return (parseInt(rnd(2))==1?n*-1:n);
  }

  this.resizeHandler = function() {
    if (window.innerWidth || window.innerHeight) {
      screenX = window.innerWidth-(!isIE?24:2);
      screenY = (flakeBottom?flakeBottom:window.innerHeight);
    } else {
      screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0);
      screenY = flakeBottom?flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
    }
    s.scrollHandler();
  }

  this.scrollHandler = function() {
    // "attach" snowflakes to bottom of window if no absolute bottom value was given
    scrollY = (flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop));
    if (isNaN(scrollY)) scrollY = 0; // Netscape 6 scroll fix
    if (!flakeBottom && s.flakes) {
      for (var i=0; i<s.flakes.length; i++) {
        if (s.flakes[i].active == 0) s.flakes[i].stick();
      }
    }
  }

  this.freeze = function() {
    // pause animation
    if (!s.disabled) {
      s.disabled = 1;
    } else {
      return false;
    }
    if (!isWin9X) {
      clearInterval(s.timers);
    } else {
      for (var i=0; i<s.timers.length; i++) {
        clearInterval(s.timers[i]);
      }
    }
  }

  this.resume = function() {
    if (s.disabled) {
       s.disabled = 0;
    } else {
      return false;
    }
    s.timerInit();
  }

  this.stop = function() {
    this.freeze();
    for (var i=0; i<this.flakes.length; i++) {
      this.flakes[i].o.style.display = 'none';
    }
    removeEventHandler(window,'scroll',this.scrollHandler,false);
    removeEventHandler(window,'resize',this.resizeHandler,false);
  }

  this.SnowFlake = function(parent,type,x,y) {
    var s = this;
    var storm = parent;
    this.type = type;
    this.x = x||parseInt(rnd(screenX-12));
    this.y = (!isNaN(y)?y:-12);
    this.vX = null;
    this.vY = null;
    this.vAmpTypes = [2.0,1.0,1.25,1.0,1.5,1.75]; // "amplification" for vX/vY (based on flake size/type)
    this.vAmp = this.vAmpTypes[this.type];

    this.active = 1;
    this.o = document.createElement('img');
    this.o.style.position = 'absolute';
    this.o.style.width = flakeWidth+'px';
    this.o.style.height = flakeHeight+'px';
    this.o.style.fontSize = '1px'; // so IE keeps proper size
    this.o.style.zIndex = 2;
    this.o.src = imagePath+this.type+(pngHandler.supported && usePNG?'.png':'.gif');
    document.body.appendChild(this.o);
    if (pngHandler.supported && usePNG) pngHandler.transform(this.o);

    this.refresh = function() {
      this.o.style.left = this.x+'px';
      this.o.style.top = this.y+'px';
    }

    this.stick = function() {
      s.o.style.top = (screenY+scrollY-flakeHeight-storm.terrain[Math.floor(this.x)])+'px';
      // called after relative left has been called
    }

    this.vCheck = function() {
      if (this.vX>=0 && this.vX<0.2) {
        this.vX = 0.2;
      } else if (this.vX<0 && this.vX>-0.2) {
        this.vX = -0.2;
      }
      if (this.vY>=0 && this.vY<0.2) {
        this.vY = 0.2;
      }
    }

    this.move = function() {
      this.x += this.vX;
      this.y += (this.vY*this.vAmp);
      this.refresh();

      if (this.vX && screenX-this.x<flakeWidth+this.vX) { // X-axis scroll check
        this.x = 0;
      } else if (this.vX<0 && this.x<0-flakeWidth) {
        this.x = screenX-flakeWidth; // flakeWidth;
      }
      var yDiff = screenY+scrollY-this.y-storm.terrain[Math.floor(this.x)];
      if (yDiff<flakeHeight) {
        this.active = 0;
        if (snowCollect) {
          var height = [0.75,1.5,0.75];
          for (var i=0; i<2; i++) {
            storm.terrain[Math.floor(this.x)+i+2] += height[i];
          }
        }
        this.o.style.left = ((this.x-(!isIE?flakeWidth:0))/screenX*100)+'%'; // set "relative" left (change with resize)
        if (!flakeBottom) {
          this.stick();
        }
      }
    }

    this.animate = function() {
      // main animation loop
      // move, check status, die etc.
      this.move();
    }

    this.setVelocities = function() {
      this.vX = vRndX+rnd(vMax*0.12,0.1);
      this.vY = vRndY+rnd(vMax*0.12,0.1);
    }

    this.recycle = function() {
      this.setVelocities();
      this.vCheck();
      this.x = parseInt(rnd(screenX-flakeWidth-1));
      this.y = parseInt(rnd(640)*-1)-flakeHeight;
      this.active = 1;
    }

    this.recycle(); // set up x/y coords etc.
    this.refresh();

  }

  this.snow = function() {
    var active = 0;
    var used = 0;
    var waiting = 0;
    for (var i=this.flakes.length-1; i>0; i--) {
      if (this.flakes[i].active == 1) {
        this.flakes[i].animate();
        active++;
      } else if (this.flakes[i].active == 0) {
        used++;
      } else {
        waiting++;
      }
    }
    if (snowCollect && !waiting) { // !active && !waiting
      // create another batch of snow
      this.createSnow(flakesMaxActive,true);
    }
    if (active<flakesMaxActive) {
      with (this.flakes[parseInt(rnd(this.flakes.length))]) {
        if (!snowCollect && active == 0) {
          recycle();
        } else if (active == -1) {
          active = 1;
        }
      }
    }
  }

  this.createSnow = function(limit,allowInactive) {
    if (showStatus) window.status = 'Creating snow...';
    for (var i=0; i<limit; i++) {
      this.flakes[this.flakes.length] = new this.SnowFlake(this,parseInt(rnd(flakeTypes)));
      if (allowInactive || i>flakesMaxActive) this.flakes[this.flakes.length-1].active = -1;
    }
    if (showStatus) window.status = '';
  }

  this.timerInit = function() {
    this.timers = (!isWin9X?setInterval("snowStorm.snow()",20):[setInterval("snowStorm.snow()",75),setInterval("snowStorm.snow()",25)]);
  }

  this.init = function() {
    for (var i=0; i<8192; i++) {
      this.terrain[i] = 0;
    }
    this.randomizeWind();
    this.createSnow(snowCollect?flakesMaxActive:flakesMaxActive*2); // create initial batch
    addEventHandler(window,'resize',this.resizeHandler,false);
    addEventHandler(window,'scroll',this.scrollHandler,false);
    // addEventHandler(window,'scroll',this.resume,false); // scroll does not cause window focus. (odd)
    // addEventHandler(window,'blur',this.freeze,false);
    // addEventHandler(window,'focus',this.resume,false);
    this.timerInit();
  }

  this.resizeHandler(); // get screen coordinates

  if (screenX && screenY && !this.disabled) {
    this.init();
  }

}

function snowStormInit() {
  setTimeout("snowStorm = new SnowStorm()",500);
}

// Generic addEventHandler() wrapper
// ---------------------------------
// A generic interface for adding DOM event handlers
// Version 1.2.20040404
//
// Code by Scott Schiller | schillmania.com
//
// Revision history:
// ---------------------------------
// v1.1.20031218: initial deploy
// v1.2.20040404: added post-load event check

var addEventHandler = null;
var removeEventHandler = null;

function postLoadEvent(eventType) {
  // test for adding an event to the body (which has already loaded) - if so, fire immediately
  return ((eventType.toLowerCase().indexOf('load')>=0) && document.body);
}

function addEventHandlerDOM(o,eventType,eventHandler,eventBubble) {
  if (!postLoadEvent(eventType)) {
    o.addEventListener(eventType,eventHandler,eventBubble);
  } else {
    eventHandler();
  }
}

function removeEventHandlerDOM(o,eventType,eventHandler,eventBubble) {
  o.removeEventListener(eventType,eventHandler,eventBubble);
}
  
function addEventHandlerIE(o,eventType,eventHandler) { // IE workaround
  if (!eventType.indexOf('on')+1) eventType = 'on'+eventType;
  if (!postLoadEvent(eventType)) {
    o.attachEvent(eventType,eventHandler); // Note addition of "on" to event type
  } else {
    eventHandler();
  }
}
  
function removeEventHandlerIE(o,eventType,eventHandler) {
  if (!eventType.indexOf('on')+1) eventType = 'on'+eventType;
  o.detachEvent(eventType,eventHandler);
}

function addEventHandlerOpera(o,eventType,eventHandler,eventBubble) {
  if (!postLoadEvent(eventType)) {
    (o==window?document:o).addEventListener(eventType,eventHandler,eventBubble);
  } else {
    eventHandler();
  }
}

function removeEventHandlerOpera(o,eventType,eventHandler,eventBubble) {
  (o==window?document:o).removeEventListener(eventType,eventHandler,eventBubble);
}

if (navigator.userAgent.toLowerCase().indexOf('opera ')+1 || navigator.userAgent.toLowerCase().indexOf('opera/')+1) {
  // opera is dumb at times.
  addEventHandler = addEventHandlerOpera;
  removeEventHandler = removeEventHandlerOpera;
} else if (document.addEventListener) { // DOM event handler method
  addEventHandler = addEventHandlerDOM;
  removeEventHandler = removeEventHandlerDOM;
} else if (document.attachEvent) { // IE event handler method
  addEventHandler = addEventHandlerIE;
  removeEventHandler = removeEventHandlerIE;
} else { // Neither "DOM level 2" (?) methods supported
  addEventHandler = function(o,eventType,eventHandler,eventBubble) {
    o['on'+eventType] = eventHandler;
    // Multiple events could be added here via array etc.
  }
  removeEventHandler = function(o,eventType,eventHandler,eventBubble) {}
}

// Safari 1.0 does not support window.scroll events - apparently netscape 6.0/6.2 and mozilla 1.4 also.
// Refer to events support table at http://www.quirksmode.org/js/events_compinfo.html

// -- end addEventHandler definition --