function $(name){
	return document.getElementById(name);
}
function getEvent(){
	if(document.all)			//IE
		return window.event;
	var func=getEvent.caller;	//FF
	while(func!=null){   
		var arg0=func.arguments[0];
		if(arg0)
			if((arg0.constructor==Event || arg0.constructor==MouseEvent) || (typeof(arg0)=="object" && arg0.preventDefault && arg0.stopPropagation))
				return arg0;
		func=func.caller;
	}
	return null;
}

function swapImage(obj,atb){
	obj.src=obj.getAttribute(atb);
}

function preLoadImage(){
	var obj=document.getElementsByTagName("IMG");
	for (i=0;i<obj.length;i++){
		if (obj[i].getAttribute("src2")){
			if (!obj[i].getAttribute("src1"))
				obj[i].setAttribute("src1",obj[i].src);
			var temp=new Image();
			temp.src=obj[i].getAttribute("src2");
		}
	}
}
preLoadImage();