How To Fix 404 errors

Couldn’t see anything on a first fast look on the source of the page, but I think there is an <a href=" starting somewhere and is not continuing (<a href="somelink.com">) or ending properly, in </a>.

And I think you should get rid of the commented
<!--<a href="#"><img src="somelink/logo.gif" alt="home" /></a> -->

Save that locally, on your PC, it doesn’t do you any good on the template.

And then there are these:

</script> in the source of your main page which, Mozilla Firefox tells me, is a “stray end tag ‘script'”. It think it’s a closing tag for something you haven’t open (you’re missing the <script> – without the trailing slash)

two ending div tags (</div>)appear to be in the wrong place

Your hostgator banner:
<strong><a href="<a href="</strong>somelink"><img src="somelink/125x125.gif" alt='some text'</a>
Please notice the double <a href="

The “RSS – Posts” link:
Firefox tells me: “An ‘a’ start tag seen but an element of the same type was lready open” and then “End tag ‘a’ violates nesting rules”.

Before your start digging on what all these mean make sure you respect starting and ending tags, this is where your problem comes from.

Edit :

Your hostgator banner:

<a href="<a href="somelink"><img src="somelink/125x125.gif" alt='some text'</a>
Please notice the double <a href="