var imgsOn=new Array;
	var imgsOff=new Array;
	var i;
	for(i=0;i<12;i++){
		imgsOn[i]=new Image();
		imgsOn[i].src="../images1/bt_"+i+"_on.gif";
		imgsOff[i]=new Image();
		imgsOff[i].src="../images1/bt_"+i+".gif";
	}
	function rollon(id){
		if(document.images)
			eval("document.images['bt_"+id+"'].src=imgsOn["+id+"].src");
	}
	function rolloff(id){
		if(document.images)
			eval("document.images['bt_"+id+"'].src=imgsOff["+id+"].src");
	}