Stray start tag, Template problems

Hi there, I'm having an issue with my website. I was running it through the W3 validator and cleaning off all errors, I managed to fix all of the errors on my site (excluding the temporary <br> tags I intend to replace out with margins), except for this one.

1. Error: Stray start tag script.From line 363, column 21; to line 363, column 28nceEnd --><script>'undef

Now this error leads one to believe that there is content placed somewhere between the </body> and the </html>, and if you look at the coding for the index.html, it is:

</table>

</div>

</body>

<!-- InstanceEnd --></html>

But it isn't in the template:

</table>

</div>

</body>

</html>

Now here's the thing, that <!-- InstanceEnd --> is part of the closing tag of the template I'm using on my site, and when applying the template to any of my pages, it automatically throws that <!-- InstanceEnd --> in between my </body> and </html>, which I assume is giving me the above error (I assume).

If that is the problem, how do I fix it so that it doesn't keep lodging itself between the closing body tag and the closing html tag? If that's not the problem, where should I direct my attention in the coding to fix this last error?

As always, any and all help is greatly appreciated.

Here is the website:

Hydraforge

I'm also aware the footer isn't centered, I'm still working on it.