Although the DOCTYPE is necessary for page validation, the lack of it wouldn't trigger problems on IE/Win (which is what I'm assuming you mean "does not work on PC" means). The lack of a DOCTYPE would trigger Quirks mode in every modern browser out there, including IE6/Win (IE5/Win didn't have a Quirks mode, since it essentally
was Quirks mode). However, I do recommend you put the DOCTYPE in anyway; the one redJag suggested will keep browsers in Quirks mode so it won't affect your layour in browsers that are already known to work.
Do you have screenshots of the problem, for those of us without access to a PC? Being able to actually see what's wrong might help.
As for code problems, Tidy pointed out 11 of them, but here are the four which are most likely to cause the issues you're having:
- In your body tag, there appears to be an extra quote mark on the end. Remove it.
- On your very first table tag, your border attribute reads as follows: "border="0" (quotes inclusive). Remove that leading quote mark.
- On Line 73, you have a left-aligned DIV, but nothing is in it. Try removing that. I'm not taking in line-wrapping into account, so you might want to search for "<div align="left"></div>" (quotes exclusive).
- On Line 79, you have an empty P tag. Try removing that. You can search for "<p></p>" (quotes exclusive) to find it.
You're also missing summary attributes on your tables (these are layout tables, so just make them blank;
summary="" quotes inclusive will work just fine). There's one image which lacks an alt attribute, but I don't know where it is. Those round out the 11 errors.
I'd suggest, by the way, putting proper alt attributes on the images you use for navigation tabs ("Home", "Forums", etc). That's just an accessibility issue.