Il css che uso x il menù che uso attualmente è questo:
#menucol {
width:100%
height:auto;
background-image: -moz-linear-gradient(top, #666666, #000000);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0.00, #666666), color-stop(1.0, #000000));
filter: progid:DXImageTransform.Microsoft.Gradient(gradientType=0,startColorStr=#666666,endColorStr=#000000);
border-bottom:1px solid #666666;
border-top:1px solid #666666;
margin:0 auto;padding:0 auto;
overflow:hidden;
}
#topwrapper {
width:100%
height:auto;
margin:0 auto;
padding:0 auto;
}
.clearit {
clear: both;
height: auto;
line-height: auto;
font-size: 0;
}
#top {
width:100%;
}
#top, #top ul {
padding: 0;
margin: 0;
list-style: none;
}
#top a {
border-right:1px solid #333333;
text-align:left;
display: block;
text-decoration: none;
padding:10px 12px 11px;
font:bold 14px Arial;
text-transform:none;
color:#eee;
}
#top a:hover {
background:#000000;
color:#F6F6F6;
}
#top a.submenucol {
background-image: url(http://3.bp.blogspot.com/-TkveEnZCoIw/Uat7PEv8kBI/AAAAAAAADsY/iqVPPTJzvUs/s1600/arrow_white.gif);
background-repeat: no-repeat;
padding: 10px 24px 11px 12px;
background-position: right center;
}
#top li {
float: left;
position: relative;
}
#top li {
position: static !important;
width: auto;
}
#top li ul, #top ul li {
width:300px;
}
#top ul li a {
text-align:left;
padding: 6px 15px;
font-size:13px;
font-weight:normal;
text-transform:none;
font-family:Arial, sans-serif;
border:none;
}
#top li ul {
z-index:100;
position: absolute;
display: none;
background-color:#F1F1F1;
margin-left:-80px;
padding:10px 0;
border-radius: 0px 0px 6px 6px;
box-shadow:0 2px 2px rgba(0,0,0,0.6);
filter:alpha(opacity=87);
opacity:.87;
}
#top li ul li {
width:150px;
float:left;
margin:0;
padding:0;
}
#top li:hover ul, #top li.hvr ul {
display: block;
}
#top li:hover ul a, #top li.hvr ul a {
color:#333;
background-color:transparent;
text-decoration:none;
}
#top ul a:hover {
text-decoration:underline!important;
color:#444444 !important;
}
#Header1_headerimg {
display: block;
margin-left: auto;
margin-right: auto;
}
]]
Ma con questo codice su mozilla e altri browser si vede bene! Con chrome no!