function rollover(arg_obj,arg_path){
	
	arg_obj.path = new Object();
	arg_obj.path.org = arg_obj.src;
	arg_obj.path.chg = arg_path;
	
	//画像のプリロード
	var img = new Image();
	img.src = arg_path;

	//マウスアクションセット
	lib.addEvent(arg_obj,"mouseover",function(){
		arg_obj.src = arg_obj.path.chg;
	},false);

	lib.addEvent(arg_obj,"mouseout",function(){
		arg_obj.src = arg_obj.path.org;
	},false);

}