how to display message in the popup window

[bindiya]

I have a login modal window which is user for entering the login and password, and check it with the database.If the login and password is not there i nthe database the message shuld be displayed in the popup window itself.

But  in my case the popup window disapperas if the login details are wrong.

how shuld i code for this.

 

My code is pasted below.

<div id="cover"></div>

<div id="dialog">

 

<form action='' method='post' name='onlinepay'>

<table width="388" border=1><tr><td colspan="4" align="right"></td><td align="right"><a href="index.php" onclick="closePopUp('dialog');"><img src='images/close.jpg' align="right" /></a></td></tr>

 

 

  <tr><td width="11" ></td>

  <td width="90">Username </td>

  <td width="57">:</td>

  <td width="147"><input type='text' name='username' id='username' /></td><td width="59"></td>

  </tr>

<tr><td></td><td>Password</td><td>:</td><td><input type='text' name='password' id='password' /></td><td><input type='submit' name='submit' id='submit' value="Login" /></td></tr><tr><td colspan='5'><?php

//connection statements goes here

 

 

if(isset($_POST['submit'])){

$username=$_POST['username'];

$password=$_POST['password'];

 

 

$sql="select username,password from register where username='$username' and password='$password'";

$result=mysql_query($sql);

$row=mysql_fetch_row($result);

 

$row1=mysql_num_rows($result);

 

if(($row['0']==$username) && ($row['1']==$password)){

 

header ('Location:themes/index.php');

}

else{

  echo "Username and password doesnot match";

}

}

 

?> </td></tr>

<tr><td colspan="5"><hr color="#999999" /></td></tr><tr><td></td><td colspan='2'><a href="javascript:void window.open('themes/forgotpassword.php?fullview=Y','','height=350,width=525,resizable=yes,scrollbars=yes')">Forgot password? </a>

              </td>

  <td><a href='register.php'>New User</a></td>

  <td align='center'> </td>

</tr>

</table>

</form>

[Adam]

Shouldn't the form submit via an AJAX post when called from the modal window?

[bindiya]

but my php code is in the same page

and when i alert the error message through javascript it works.But the echo error mesg doesnot work

 

[bindiya]

error printing like "username and login doesnot match '  in my popup window is the one i need, after login check