DIV Layout Issue, Trouble with shifts in DIV locations for an overlay style layout. Options

[fineartsbaby]

I created a DIV layout - made everything in it and coded it all myself - and had only one issue. I recall solving this problem before, but I could not, for the life of me, remember how I had gone about it before. In short:

Issue: The text in my DIVs (or, really, the DIV's themselves) shifts based on where the taskbar is on your screen - that is, it is out of the boxes on my background if the taskbar is to the left, correct if across the bottom (originally the issue was the reverse, but I have adjusted it in the meantime since most people keep the taskbar across the bottom of their screen). If you care to see the page with the issue, go to www.myspace.com/fineartsbaby

Any help would be greatly appreciated. :)