How to validate a form in light box?

I Added a form into light box. I have to validate the form input and send an email with details entered in it. I did 开发者_JS百科that, and it is working fine. But the problem is, that after I added the form in light box, the validation is not working, but the email is being sent. I need to validate the form in light box.

Does anyone know how to do this? Please help me!

To avoid this XHTML 1.1 validation problem simply edit the following line in the Lightbox 2 plugin file named lightbox2.php under the "autoexpand_rel_wlightbox" function:

from:

$replacement    = '$1 rel="lightbox['.$post->ID.']">';

to:

$replacement    = '$1 rel="lightbox_'.$post->ID.'">';

character [ is not allowed in the value of attribute rel