jsp里写了javascript，但运行jsp时没有提示运行脚本，也就是javascript不起作用，怎么回事
这是jsp文件<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns=" http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>登陆页面</title>
<style type="text/css">
<!--
.STYLE1 {
font-size: 36px;
color: #0066FF;
}
.STYLE3 {color: #0066FF; font-size: 18px; }
.STYLE4 {color: #CC0033}
-->
</style>
<script language="javascript">
function check()
{
if(form1.username.value=="")
{
alert("用户名不能为空，请输入用户名！");
form1.usrname.focus();
return false;
}
if(form1.password.value=="")
{
alert("用户密码不能为空！请输入密码!");
form1.password.focus();
return false;
}
if(form1.Rand.value=="")
{
alert("用户验证码不能为空，请输入正确的验证码!");
form1.Rand.value=="";
return false;
}
if(form1.Rand.value.indexOf("123456789")==-1)
{
alert("验证码必须为整数!");
form1.password.focus();
return false;
}
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="servlet/logincheck" OnSubmit="return check()">
<table width="1000" height="368" border="0" align="center">
<tr>
<td colspan="6"><div align="center" class="STYLE1">超市进销存管理系统</div></td>
</tr>
<tr>
<td width="128" rowspan="3"><img src="image/lock_open.png" width="128px" height="128px" /></td>
<td width="142" height="44"><div align="right" class="STYLE3">用户名：</div></td>
<td width="243"><label>
<input type="text" name="username" />
</label></td>
<td width="218"> </td>
<td colspan="2"> </td>
</tr>
<tr>
<td height="48"><div align="right" class="STYLE3">密 码：</div></td>
<td><label>
<input type="password" name="password" />
</label></td>
<td> </td>
<td colspan="2"> </td>
</tr>
<tr>
<td height="39"><div align="right" class="STYLE3">验证码：</div></td>
<td><label>
<input type="text" name="Rand" >
<script>document.write("<img border=0 src='image.jsp?Rand="+Math.random()*10000+"'>");</script>
</label></td>
<td> </td>
<td width="85"><label>
<input type="submit" name="Submit" value="登陆" />
</label></td>
<td width="158"><label>
<input type="reset" name="reset" value="重置" />
</label></td>
</tr>
<tr>
<td height="72" colspan="6"><div align="center">
<p class="STYLE4">版权所有CopyRight © All Rights Reserved</p>
</div></td>
</tr>
</table>
</form>
</body>
</html>
追问：有啊，我写在form表单的OnSubmit里了<form id="form1" name="form1" method="post" action="servlet/logincheck" OnSubmit="return check()">
