IE doesn't render the W3C box modal correctly, but FF does. The problems you are having is not your code... its just that FF is rendering the HTML and CSS the way it was intended and IE is Bill Gatesing you.Just google IE box modal fixes, there are a ton of tutorials related to it... espessially when talking about liquid, tableless, div based sites using css.as far as your centering problem, use the negative margin theory:set the left of an element at 50%set that elements left margin at its negative halfexample:#container {position:absolute;width:500px;left:50%;margin-left:-250px;}that center the mess out of anything. =) enjoy