/**
 * Cross browser event handler related javascript module.  Also it is
 * W3 recommended global event handler module with few ammendments of Parity.
 *
 * @author Veeresh D.
 * @date March 2008
 */


function addEvent(elem, eventType, handler)
{
	if (!elem.eventHandlers) 
		elem.eventHandlers = [];
	if (!elem.eventHandlers[eventType])
	{
		elem.eventHandlers[eventType] = [];
		if (elem['on' + eventType]) 
			elem.eventHandlers[eventType].push(elem['on' + eventType]);
		elem['on' + eventType] = handleEvent;
	}
	elem.eventHandlers[eventType].push(handler);
}

function removeEvent(elem, eventType, handler)
{
	var handlers = elem.eventHandlers[eventType];
	for (var i in handlers) 
		if (handlers[i] == handler) 
			delete handlers[i];
}

function handleEvent(e)
{
	var returnValue = true;
	if (!e) e = fixEvent(event);
	var handlers = this.eventHandlers[e.type]
	for (var i in handlers)
	{
		this.$$handleEvent = handlers[i];
		returnValue = !((returnValue && this.$$handleEvent(e)) === false);
	}
	return returnValue;
}

function fixEvent(e)
{
	// add W3C standard event methods
	e.preventDefault = fixEvent.preventDefault;
	e.stopPropagation = fixEvent.stopPropagation;
	return event;
};

fixEvent.preventDefault = function() 
{
	this.returnValue = false;
};

fixEvent.stopPropagation = function() 
{
	this.cancelBubble = true;
};