hi im also just starting out with learning html code

I have a problem with html tables. Im working on a myspace layout for my band. the table layout looks great in IE but not in Firefox. I can give you a link to the page

http://www.myspace.com/northeytest

and even the coding if you need to see it

The problem is that i have two tables under two different <div> classes. both div calsses are set the same, that are set to an absolute position, a left margin of -400px (each table is 800px in width) and a left positioning of 50%. the only difference is the second one has a margin at the top of 942px. In IE, this works fine, but in firefox, the table is halfway off the page on the left hand side unless i change the margin to 105%.

please help me