使用ajax的登录页面

<table width="1002px" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td style="padding-top: 2px;">
<table width="1000" height="28" border="0" cellpadding="1" cellspacing="0" class="K_01">
<tr>
<td width="106">
<img src="../images/login.gif" width="106" height="26" /></td>
<td width="502" style="padding-left:5px;">
<table id="loginform" width="440" border="0" cellspacing="1" cellpadding="1">
<tr>
<td>
用户名：</td>
<td>
<input id="txtloginid" type="text" name="textfield4" style="width: 120px;" /></td>
<td>
密 码：</td>
<td>
<input id="txtpsw" type="password" name="textfield2" style="width: 120px;" /></td>
<td width="10%">
<img src="../images/dl.gif" width="48" height="22" style="cursor:hand;" id="login" /></td>
</tr>
</table>