ul, ul li, ul ul {
 list-style: none;
 margin: 0;
 padding: 0;
 top:-0.5px;
}

ul#nav {
 position: relative;
 z-index: 597;
 float: left;
}

ul#nav li {
 float: left;
 line-height: 0;
position:relative;
}

ul#nav ul {
 position: absolute;
 top: 100%;
 left: 0;
 z-index: 598;
 width: 100%;
 background-color:white;
}

.headlink ul { 
backgroun-color:white;
display:none;
top:-5px;
} 

 <!--[if IE]>
ul, ul li, ul ul {
 top:0px;
}
<![endif]-->