(function($){
 $(function(){
  $(".main_text img").animate({opacity: "1.0"}, 300);
// host_url + "img/main/menu_on_" + num + ".png";
  var host_url = "/bizdemo13119/";
  $("li.menu_1dep ul").hide();
  $("li.menu_1dep").hover(function(){
   var num = $(".main_img img", this).attr("data");
   var img_url = host_url +  "img/menu_on_" + num + ".gif";
   $(".main_img img", this).attr("src", img_url);
   $("ul", this).show();
   },function(){
   var num = $(".main_img img", this).attr("data");
   var img_url = host_url +  "img/menu_" + num + ".gif";
   $(".main_img img", this).attr("src", img_url);
   $("ul", this).hide();
  });

 });
})(jQuery);