Contact Form Problem

Hello!

I have problem with contact form:

Well, when I use it and fill all area with right content and click send nothing happens at first time. When I fill data again with even another content server returns: email sent and I'm receiving it.

The problem is that at first time nothing happens. It's not returning even an error. I'm a bit worried about that, because visitors won't send me second email.

Check it out: http://rici.webd.pl/?page_id=135

Thank u for ur support!