Form with web address field returns a 403 Forbidden if filled in

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Ok, I've narrowed down mt 403 forbidden - index.php problem. I deleted everything and started over. I created a new form and page to put it on. i started with a couple of fields like name (text input) and type (select box) and it worked. So, I added the remaining fields for the form. I have a number of text inputs that are set to web address and one set for email. If I fill in the form and enter in an HTTP:// web address and try to submit, I get a 403 forbidden error. If I take of the HTTP:// prefix, the validation catches it and won't let me submit the form. So, it doesn't like the HTTP:// part. I'm not sure how to fix this. I could get around it maybe with just plain text boxes and no HTTP:// prefix. that may not work either. If you have any suggestions, please reply.

I'm on shared at Liquidweb at the moment. I'll check to see if I can submit a web address via a plain text box.

Thanks