site looks fine in firefox, terrible in ie Options

[turniphead-stuff]

Normally when I code, I don't have a problem in internet explorer, but this layout I coded is really off. Some of the divs are lined up, others aren't. I was wondering if someone could help me get lined up.. Thanks..
This sidebar and sidebar 2 look fine, the rest are way off!

my site is overlookedd.com

CODE

.headerimage {position:absolute; left:0px; top: 0px;}
#contentbar {position:absolute; top:770px; left:250px; width:500px;}
#topads {position:absolute; top:2px; height:90px; left:150px; width:728px;}
#ads {position:absolute; top:532px; left:439px; width:300px;}
#nav {position:absolute; top:532px; left:250px; width:186px;}
#sidebar {position:absolute; top:516px; left:70px; width:178px;}
#sidebar2 {position:absolute; width:178px; top:513px; left: 751px;}
#footer {position:absolute; width:500; }
#updates {position:absolute; top:156px; left:645px; height: 86px; width:244px; z-index:9; overflow:auto;}
#advertisement {position:absolute; top:421px; left:90px; height: 55px; width:120px; z-index:9; overflow:auto;}