var ImgAry=['images/display_webdesign.jpg','images/display_printdesign.jpg','images/display_photography.jpg']
		var MapAry=[];
		 for (var zxc0=0;zxc0<ImgAry.length;zxc0++){
		  MapAry[zxc0]=new Image();
		  MapAry[zxc0].src=ImgAry[zxc0];
		 }

		function Swap(id,nu){
		 document.getElementById(id).src=MapAry[nu].src;
}