jQuery.preloadImages = function()
{
	for(var i = 0; i<arguments.length; i++)
	{
        jQuery("<img>").attr("src", arguments[i]);
	}
}
$(document).ready(function() {
$("#menu_bt").click(function(){
$("dl").toggle("slow");
$("dl").css = ("z-index","100"); 
$("ul").css = ("z-index","1"); 
})
 var conf = {
    className : 'btn',
    postfix : '_on'
  };
  $('img.'+conf.className).hover(function(){
    this.originalSrc = this.src;
    this.src = this.originalSrc.replace(/(\.gif|\.jpg)/,
	                                       conf.postfix+"$1");
  },function(){
    this.src = this.originalSrc;
})
});
$.preloadImages("../s_img/menu_on.gif","../s_img/recommend.gif","../s_img/style_on.gif", "../s_img/plus_on.gif","../s_img/item_on.gif","../s_img/up_on.gif","../s_img/back_on.gif","../s_img/next_on.gif","../s_img/detail_on.gif","../s_img/out.gif","../s_img/out_on.gif");