How can I go to a new page after click ok in alert

[lmsook]

Hello,
I know this thread may be more like in the Javascript forum, but I need your help.

My codes are

<?php
....
if (isExistingShowtime($db)) { 
?> 
    <script language="javascript"> 
    <!-- 
        alert("this showtime has been already in my schedule"); 
         
    --> 
    </script> 
<?php 
    header("location:$_SERVER[HTTP_REFERER]"); 

} else { 
} 
?>

I want to check if $db is the existing one, and if it is, it shows alert, and when ok button is pressed, go back to the calling page.

However, when isExistingShowtime($db) is true, it always redirects to the calling page without showing alert.

And if I comment out like this,

//  header("location:$_SERVER[HTTP_REFERER]"); 

it shows alert, but still in the same page when I click ok.

Is there any way I can accomplish my goal?

Thanks

[clamcrusher]

use javascript to do the redirect. like you said, this belongs in the javascript forum.

the only thing your using php for is to decide whether or not to echo the javascript.