mySql with PHP

So I had someone build me this site so I could play around and try to learn PHP. I believe thus far I have failed. My site www.midgatrades.com used to have all the content and now is blank. Also when I try to post and ad www.midgatrades.com/post.htm it just hangs up. I was wondering if someone would like to look further into it. I have read through all the PHP code and can't find anything. If someone wants to take a look at it PM me and I will send you the PHP code and let you look around.

Why not post the PHP code and tell us the exact line which is causing it to hang.