I would run this through a page validator. there are several issues with thte code making it non-standard which could be causing alot of your issues..
http://validator.w3.org/check?uri=ht...line&verbose=1
this link will help.
You have missed alot of basic things that will help clear up.
Move your Javascript and CSS to seperate file from the pages.
Validate your markup.. You have several errors in this area.
On a positive not I love the DiskKeeper product.. I current use version *.0 it does a great job.
Hope this helps