/**
 * COMMON DHTML FUNCTIONS
 * These are handy functions I use all the time.
 *
 * By Seth Banks (webmaster at subimage dot com)
 * http://www.subimage.com/
 *
 * Up to date code can be found at http://www.subimage.com/dhtml/
 *
 * This code is free for you to use anywhere, just keep this comment block.
 */

/**
 * X-browser event handler attachment and detachment
 * TH: Switched first true to false per http://www.onlinetools.org/articles/unobtrusivejavascript/chapter4.html
 *
 * @argument obj - the object to attach event to
 * @argument evType - name of the event - DONT ADD "on", pass only "mouseover", etc
 * @argument fn - function to call

 
 
 
 function addEvent(obj, evType, fn, useCapture)
{
	//-- Default to event bubbling
	if (!useCapture) useCapture = false;

	//-- DOM level 2 method
	if (obj.addEventListener)
	{
		obj.addEventListener(evType, fn, useCapture);
	}
	else
	{
		//-- event capturing not supported
		if (useCapture)
		{
			alert('This browser does not support event capturing!');
		}
		else
		{
			var evTypeRef = '__' + evType;

			//-- create function stack in the DOM space of the element; seperate stacks for each event type
			if (!obj[evTypeRef])
			{
				//-- create the stack if it doesn't exist yet
				obj[evTypeRef] = [];

				//-- if there is an inline event defined store it in the stack
				var orgEvent = obj['on'+evType];
				if (orgEvent) obj[evTypeRef][0] = orgEvent;

				//-- attach helper function using the DOM level 0 method
				obj['on'+evType] = IEEventHandler;
			}
			else
			{
				//-- check if handler is not already attached, don't attach the same function twice to match behavior of addEventListener
				for (var ref in obj[evTypeRef])
				{
					if (obj[evTypeRef][ref] === fn) return;
				}
			}

			//-- add reference to the function to the stack
			obj[evTypeRef][obj[evTypeRef].length] = fn;
		}
	}
}
 */
/**
  * removeEvent
  *
  * Generic function to remove previously attached event listeners.
  *
  * @param obj The object to which the event listener was attached.
  * @param evType The eventtype, eg. 'click', 'mousemove' etcetera.
  * @param fn The listener function.
  * @param useCapture (optional) Whether event capturing, or event bubbling (default) was used.

function removeEvent(obj, evType, fn, useCapture)
{
	//-- Default to event bubbling
	if (!useCapture) useCapture = false;

	//-- DOM level 2 method
	if (obj.removeEventListener)
	{
		obj.removeEventListener(evType, fn, useCapture);
	}
	else
	{
		var evTypeRef = '__' + evType;

		//-- Check if there is a stack of function references for this event type on the object
		if (obj[evTypeRef])
		{
			//-- iterate through the stack
			for (var ref in obj[evTypeRef])
			{
				//-- if function reference is found, remove it
				if (obj[evTypeRef][ref] === fn)
				{
					try
					{
						delete obj[evTypeRef][ref];
					}
					catch(e)
					{
						obj[evTypeRef][ref] = null;
					}

					return;
				}
			}
		}
	}
}
  */
/**
  * IEEventHandler
  * 
  * IE helper function to execute the attached handlers for events.
  * Because of the way this helperfunction is attached to the object (using the DOM level 0 method)
  * the 'this' keyword will correctely point to the element that the handler was defined on.
  *
  * @param e (optional) Event object, defaults to window.event object when not passed as argument (IE).

function IEEventHandler(e)
{
	e = e || window.event;
	var evTypeRef = '__' + e.type;

	//-- check if there is a custom function stack defined for this event type on the object
	if (this[evTypeRef])
	{
		//-- iterate through the stack and execute each function in the scope of the object by using function.call
		for (var ref in this[evTypeRef])
		{
			if (Function.call)
			{
				this[evTypeRef][ref].call(this, e);
			}
			else
			{
				//-- IE 5.0 doesn't support call or apply, so use this
				this.__fn = this[evTypeRef][ref];
				this.__fn(e);
				this.__fn = null;
			}
		}
	}
}
 
   */
 
 
 
 
 
 
 
 
 
 
function addEvent(obj, evType, fn){
 if (obj.addEventListener){
    obj.addEventListener(evType, fn, false);
    return true;
 } else if (obj.attachEvent){
    var r = obj.attachEvent("on"+evType, fn);
    return r;
 } else {
    return false;
 }
}
function removeEvent(obj, evType, fn, useCapture){

  if (obj.removeEventListener){
    obj.removeEventListener(evType, fn, useCapture);
    return true;
  } else if (obj.detachEvent){
    var r = obj.detachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be removed");
  }
}

/**
 * Code below taken from - http://www.evolt.org/article/document_body_doctype_switching_and_more/17/30655/
 *
 * Modified 4/22/04 to work with Opera/Moz (by webmaster at subimage dot com)
 *
 * Gets the full width/height because it's different for most browsers.
 */
function getViewportHeight() {
	if (window.innerHeight!=window.undefined) return window.innerHeight;
	if (document.compatMode=='CSS1Compat') return document.documentElement.clientHeight;
	if (document.body) return document.body.clientHeight; 
	return window.undefined; 
}
function getViewportWidth() {
	if (window.innerWidth!=window.undefined) return window.innerWidth; 
	if (document.compatMode=='CSS1Compat') return document.documentElement.clientWidth; 
	if (document.body) return document.body.clientWidth; 
	return window.undefined; 
}