You must enter a Title / Subject! code

[Jason2]

When you create a thread without a title, it says:

You must enter a Title / Subject! code

What code is that, and what file is it situated in?

I've added the phrase to an hack I'm developing; but how would I validate the input box? I know I should be asking at vb.org -- I was hoping a vb dev or someone else could pop in :)

Thanks.

[Jason2]

Any devs about? I have this code:

$url = "http://www.yoursiteurl.com/yourscript.php";
standard_redirect("Redirect Message.",$url);

However, if they haven't entered a title/subject, then using this method they will lose everything they have typed. Now, what code (and where can I find it) do vBulletin use to make the popup box?

Thanks!