Php/Ajax redierecting problem

Hi All,

I am a newbie in Ajax. While i was working with login page, i am checking the user name and passwords and i am not able to redirect the page using the code:

$rs1=mysql_query("my Query");

        $response = "Invalid login...";
        echo $response;

Actually i am sending back the response if the login has error, else i want to redirect the page.
But this redirect is not working properly.

Can anybody help me with a fast solutionā€¦ Im screwd.

Thanx in advanceā€¦