Hello this is the main difference in how the two browsers handle HTML or stylesheets.
What language are you using? Post an excerpt of the code in the Discussion and I’ll see if this can be solved.
Maybe this is due to the difference in the box model between FF and IE. Or better, between IE and the standard.
I’d try to make the browser display the page in “standars mode”, this might make both browser behave the same.
For this to happen (sorry if I’m being too explicit) you need to add a “DOCTYPE” to the HTML document.
This issue is best explained by P P Koch in http://www.quirksmode.org/css/quirksmode.html