/*


    Common code for re-use


*/



function addEvent( obj, type, fn ) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}

var EventCache = function(){
	var listEvents = [];
	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function(){
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				};
				item[0][item[1]] = null;
			};
		}
	};
}();
addEvent(window,'unload',EventCache.flush);

function Setup()
{
	PerformImageSwap( "hover", "input" );
    PerformImageSwap( "hover", "img" );
}

function PerformImageSwap( className, type )
{
    var itemSrc = '';
    var els = document.getElementsByTagName(type); //Not supported by safari
    for ( var i = 0, j = els.length ; i < j ; i++ )
    {
        if (els.item(i).className.indexOf(className) != -1)
        {

            itemSrc = els.item(i).src;
            //These expando properties are used to store values against the element as the loop runs
            
            els[ i ].srcOn = itemSrc.substring(0,itemSrc.length-4) + '_on' + itemSrc.substring(itemSrc.length,itemSrc.length-4);
            els[ i ].srcOff = itemSrc
            
            els.item(i).onmouseover = function()
            {
                this.src = this.srcOn;
            }
            
            els.item(i).onmouseout = function()
            {
                this.src = this.srcOff;
            }
        }
    }
     
}

addEvent(window,'load', Setup);