TheHolierGrail:active{version:2.0}

style:focus{css-only:dropdown-menu}

CSS Menus show behind select elements on MSIE 6 and older

But the z-index bug is not found here, even when an element that appears later in the source has position:relative set. This is because we've set the UL parent to position:relative and assigned a z-index; this nullifies the MSIE z-index bug for our menu.

Update

2008.JUL.08 - Single iframe element added for IE lte 6 to cover stubborn select elements.