li ul {position: absolute;
         /*left: 99px;*/ /* Set 1px less than menu width */
        /* top: 100;*/
         display: none
        
        } 
        
/* IE Requirement */
 * html ul li { float: left; height: 1% }
 * html ul li a { height: 1% }
 /* End */ 

li:hover ul, li.over ul { display: block } /* The magic */