有人可以帮助解决我的代码中的这个错误。当我在 Internet Explorer 中启动网站时出现此错误：
JavaScript 运行时错误：“$”未定义
这是代码请帮助我在java脚本中需要更改什么？
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
div.world_map_container #transparent_map {
border: medium none;
height: auto;
position: absolute;
width: auto;
z-index: 30;
}
ul li {
display: none;
position: absolute;
text-indent: -9999px;
z-index: 20;
}
#home_resen {
background: url("Sliki/resen.gif") no-repeat;
height: auto;
right: 0;
top: 0;
width: auto;
}
#home_skopje {
background: url("Sliki/skopje.gif") no-repeat;
height: auto;
right: 0;
top: 0;
width: auto;
}
#home_kocani {
background: url("Sliki/kocani.gif") no-repeat;
height: auto;
right: 0;
top: 0;
width: auto;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="world_map_container">
<img src="Sliki/map.jpg" usemap="#the_world_map" id="transparent_map" />
<map name="the_world_map" id="the_world_map">
<area shape="poly" coords="167,335,168,321,166,318,161,313,156,308,148,308,146,304,143,302,137,301,136,293,133,283,130,277,127,273,127,270,129,266,133,261,133,253,132,248,128,242,124,240,121,240,118,243,114,248,108,254,100,258,94,261,92,261,91,268,87,274,83,279,81,281,81,286,81,291,81,295,75,298,69,304,67,308,66,316,69,318,79,319,86,319,88,321,91,324,94,326,100,325,102,322,103,317,100,315,95,314,88,312,85,308,87,303,90,300,94,297,98,294,104,293,109,293,113,295,119,303,124,311,127,318,130,327,131,335,132,338,135,336,140,332,144,331,148,331,151,333,155,336,162,336,167,335" href="Default2.aspx" id="area_resen" alt="Resen" />
<area shape="poly" coords="171,45,167,47,161,47,162,50,167,50,167,53,164,55,157,64,161,68,169,88,172,89,175,102,175,105,179,105,180,109,187,116,187,118,202,121,202,124,212,124,216,121,216,116,245,116,253,113,255,110,254,104,253,103,259,103,265,104,269,105,272,103,272,95,274,90,277,87,282,86,285,84,287,78,288,76,280,75,274,74,270,72,265,67,263,63,257,63,254,60,251,57,250,56,247,57,241,56,237,55,234,52,229,49,227,44,227,38,231,35,233,33,231,31,226,29,225,28,225,21,220,20,216,22,213,24,212,26,210,28,207,28,205,26,202,26,200,28,199,31,196,33,192,39,188,43,189,45,189,47,185,50,179,52,175,52,172,50,171,47,171,45" href="Default2.aspx" id="area_skopje" alt="Skopje" />
<area shape="poly" coords="397,47,388,47,383,56,384,61,384,66,382,70,379,71,375,71,375,76,373,82,372,88,372,94,377,96,389,109,408,109,409,98,405,92,409,89,406,80,412,80,421,77,424,74,423,68,429,66,425,63,415,53,398,53,397,47" href="Default2.aspx" id="area_kocani" alt="Kocani" />
</map>
<ul>
<li id="resen"><a href="#">resen</a></li>
<li id="skopje"><a href="#">skopje</a></li>
<li id="kocani"><a href="#">kocani</a></li>
</ul>
</div>
<script type="text/javascript">
$('.world_map_container area').each(function () {
// Assigning an action to the mouseover event
$(this).mouseover(function (e) {
var country_id = $(this).attr('id').replace('area_', 'home_');
$('#' + country_id).css('display', 'block');
});
// Assigning an action to the mouseout event
$(this).mouseout(function (e) {
var country_id = $(this).attr('id').replace('area_', 'home_');
$('#' + country_id).css('display', 'none');
});
});
</script>
</form>