countcobolt

everyone
I seem to experience problems with my css stylesheet in IE (mozilla based browsers work fine). I have defined a div like this:
div.centerpart {
position:absolute;
left:150px;
right:50px;
top:75px;
bottom:75px;
z-index:2;
background-color:grey;
overflow:auto;
}
As you can see I defined a top left and bottom right coordinate so this div would be resizable. That way the surrounding divs are staticly defined and the inner div (containing the regular gibberish) is size according to the space left in the browser. (trying to avoid scrollbars).
This seems to work fine in mozilla. Can someone tell me what I would need to use to deinfe sth like this that does work in IE?

thanks in advance
Steve