http://www.alistapart.com/articles/horizdropdowns/
/* Fix IE. Hide from IE Mac \*/
* html ul li { float: left; }
* html ul li a { height: 1%; }
/* End */
We can apply the Holly Hack above, which hides these rules from all browsers but IE the height: 1% rule that has also been added as the float fix uncovers another IE bug, which requires a height value to make the links display as block-level elements.