[VE][76] Error Message Feedback

Hey, i am trying to fix my html codes. It works just fine in internet explorer, but in firefox, it looks like total junk. When i put in the url of my page, it comes up with many errors. I code my site using Dreamweaver, and when i try to fix the codes, there is nothing to fix. They look just fine. Can you please help me? I dont know what to do.

http://prowlerconcepts.tk