var path = "img/";
	var format = ".gif";
	var preover = "-over";
	var ImgSrc,Img;
			
	function swap (name){
	ImgSrc=document[name].src;
	Img=document[name];
	document[name].src = path+name+preover+format;;
	}
			
	function restore (){
	Img.src = ImgSrc;
	}
			
	PreloadArray=new Array();
	
	function Preload ()	
	{
		var imgOver = new Array();
		for (var i = 0; i < PreloadArray.length; i++)
		{
			imgOver[i] = new Image();
			imgOver[i].src = PreloadArray[i] ;
		}
	}