Forums Help, XHTML Validation - Javascript

Well i need help on my forums, I do not know much about php or javascript at all, just html and css. Currently, my page has 14 errors which makes it unsupported by IE7, as I have been told. Can someone fix this problem for me? I would greatly appreciate it, Thank you very much :D


I have included the file within this post. Here's the validation.

Validation (http://validator.w3.org/check?uri=http%3A%2F%2Finphinitesound.6te.net%2Fforums%2Findex.php&charset=%28detect+automatically%29&doctype=Inline&group=0)

Those are all (X)HTML related errors, and I would be surprised if anyone would be willing to fix all of them for you. The validator gives you the line, the error, and a suggestion about how to fix it..

So how can I fix these problems myself?

I know html, xhtml, and css a bit, but don't know what I'm looking at when its php.