后台登录：有关于验证码的问题，有请大家帮助！
<body><form action="yan.asp" method="POST" name="form1" id="form1">
<table align="center" cellspacing="0" cellpadding="0" width="555" border="0" style="border-collapse: collapse" bordercolor="#111111">
<tbody>
<tr>
<td width="588"><table align="center" cellspacing="0" cellpadding="0" width="558" border="0" style="border-collapse: collapse" bordercolor="#111111">
<tbody>
<tr>
<td valign="top" width="360" height="104"><table width="600" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td colspan="2"><img src="../images/Admin_Login1.gif" width="600" height="126" /></td>
</tr>
<tr>
<td width="508" valign="top" background="../images/Admin_Login2.gif"><table width="508" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="37" colspan="6"> </td>
</tr>
<tr>
<td width="75" rowspan="2"> </td>
<td width="126"><font color="#043BC9">用户名称：</font></td>
<td width="39" rowspan="2"> </td>
<td width="112"><font color="#043BC9">用户密码：</font></td>
<td width="53"> </td>
<td width="103"><font color="#043BC9"><b><font color="#ff0000"><img
src="GetCode.asp" width="100" height="35" align="absmiddle" /></font></b></font></td>
</tr>
<tr>
<td><input name="username" id="username" size="15" /></td>
<td><input name="pass" type="password" id="pass" size="12" /></td>
<td align="right"><span class="STYLE1">验证码:</span></td>
<td><input name="yan" type="text" id="yan" size="12" /></td>
</tr>
</table></td>
<td><input type="image" name="Submit" src="../images/Admin_Login3.gif" style="width:92px; HEIGHT: 126px;" /></td>
</tr>
</table></td>
</tr>
</tbody>
</table></td>
</tr>
</tbody>
</table>
</form>
</body>
