asp脚本有注入点，这段代码应该如何修改呀？
<!--#include file="head.asp"--><style>
body{background:#fff;}
</style>
<%if Session("Usr_Username")<>"" then response.Redirect("user_index.asp")%>
<br>
<br>
<TABLE width=404 border=0 align="center" cellPadding=0 cellSpacing=1 bgcolor="#FF7E00" id=table3>
<TBODY>
<TR>
<TD width=770 vAlign=top bgcolor="#FFE6CB"><table width="100%" height="80" border="0" cellpadding="5" cellspacing="0">
<form action="login.asp" method="post">
<tr>
<td colspan="3" bgcolor="#FFBF79" class="font_4">商户登陆</td>
</tr>
<tr>
<td width="29%"><div align="center"><span style="font-size: 12px; letter-spacing:2px">用户名</span></div></td>
<td colspan="2"><input type="text" name="Usr_name" size="20" style="font-family: Verdana; font-size: 12px; width: 128; height: 21; border: 1px solid #82C5FA; padding-left: 3px; padding-right: 3px; padding-top: 2px" /></td>
</tr>
<tr>
<td><div align="center"><span style="font-size: 12px; letter-spacing:2px">密 码</span></div></td>
<td colspan="2"><input type="password" name="Usr_pass" size="20" style="font-family: Verdana; font-size: 12px; width: 128; height: 21; border: 1px solid #82C5FA; padding-left: 3px; padding-right: 3px; padding-top: 2px" /></td>
</tr>
<tr>
<td><div align="center"><span style="font-size: 12px; letter-spacing:2px">验证码</span></div></td>
<td width="26%"><input type="text" name="Usr_check" size="20" style="font-family: Verdana; font-size: 12px; width: 41; height: 21; border: 1px solid #82C5FA; padding-left: 3px; padding-right: 3px; padding-top: 2px" maxlength="4" /></td>
<td width="45%"><img src="code.asp" border="0" /></td>
</tr>
<tr>
<td colspan="3"><TABLE width="39%"
border=0 align="center" cellPadding=0 cellSpacing=0>
<TBODY>
<TR>
<TD><INPUT type=image
src="images/pay_index04.jpg" value="登 录"
name=submit></TD>
<TD align=right><A
href="web_regFloder.asp"><IMG
height=22 src="images/pay_index05.jpg"
width=64
border=0></A></TD>
</TR>
</TBODY>
</TABLE></td>
</tr></form>
</table></TD>
</TR>
</TBODY>
</TABLE>
<!--#include file="foot.asp"-->
就是以上脚本！！！！！！！
