asp表单读取js变量值 - Web 开发 / ASP

我的js代码为：
<SCRIPT language="JScript">

function GetID()
{


try{

document.form1.ViewID.value = Get_ID();

}
catch(error)
{
alert(error.number & 0xFFFF);
return false;
}
}

</SCRIPT>


asp中代码：

 <form name="form1" action="login.asp" method="post">
<tr>
  <td align="right" width="68"><span class="style1">用户名：</span></td>
  <td width="106"><input name="Id" type="text" size="15"></td>
  </tr>
  <tr>
  <td align="right" width="68"><span class="style1">密　码：</span></td>
  <td width="106"><input name="Password" type="password" size="15"></td>
  <td><input type=hidden name="ViewID" value=""></td>
  </tr>
  <tr>
  <td colspan="2"><table width=&