function on_over_module(prename, imgid, idx){
		var strImg ="/images/" + prename + "_" + idx + "_down.gif";
		var oImg = eval("document.all." + imgid)[idx];
		oImg.src = strImg;
	}
	function on_out_module(prename, imgid, idx){
		var strImg ="/images/" + prename + "_" + idx + ".gif";
		var oImg = eval("document.all." + imgid)[idx];
		oImg.src = strImg;
	}