鼠标画线问题

<html xmlns:v><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title></title>
<link rel="stylesheet" type="text/css" href="#">
<style>
v\:*{behavior:url(#default#vml)}/*声明v为vml变量*/
</style>
</head>
<body>
<v:Line id=Line style="z-index:2000;position:absolute" from="0,0" to="200,200">
<v:stroke dashstyle="shortdash"></v:stroke>
</v:Line>
<body>