img {border:0px;}
 
ul { margin:0px;padding:0px; z-index:2; position:relative;  }
<!--- position:relative; ---> 
 
.menu1 {
float:left; width:600px; height:42px; z-index:500; overflow:visible;
}

.menu1 ul {
padding:0;margin:0;list-style-type:none; overflow:visible
}

.menu1 ul li {
float:left; position:relative; background:url(images/divider1.gif) no-repeat top right;
}

.menu1 ul li a, .menu1 ul li a:visited {
float:left; display:block; padding:0px; line-height:25px; height:42px;
}

.menu1 ul li:hover {width:auto;}

.menu1 ul li a.menu1one:hover { border-color:#c00; color:#f88;}
.menu1 ul li a.menu1two:hover {border-color:#c60; color:#fc0;}
.menu1 ul li a.menu1three:hover {border-color:#cc0; color:#cc0;}
.menu1 ul li a.menu1four:hover {border-color:#080; color:#0e0;}
.menu1 ul li a.menu1five:hover {border-color:#00c; color:#aaf;}
.menu1 ul li a.menu1six:hover {border-color:#c0c; color:#f8f;}
.menu1 ul li:hover a.menu1one {border-color:#c00; color:#f88;}
.menu1 ul li:hover a.menu1two {border-color:#c60; color:#fc0;}
.menu1 ul li:hover a.menu1three {border-color:#cc0; color:#cc0;}
.menu1 ul li:hover a.menu1four {border-color:#080; color:#0e0;}
.menu1 ul li:hover a.menu1five {border-color:#00c; color:#aaf;}
.menu1 ul li:hover a.menu1six {border-color:#c0c; color:#f8f;}

.menu1 ul li ul {
display: none;
}
.menu1 table {
margin:0; border-collapse:collapse; position:absolute; top:0; left:0;
}

/* specific to non IE browsers */
.menu1 ul li:hover ul {
display:block;position:absolute;top:42px;left:0;width:200px;border-bottom:4px solid #43260f;
}
.menu1 ul li:hover ul.endstop {
left:-92px;
}
.menu1 ul li:hover ul li ul {
display: none;
}
.menu1 ul li:hover ul li a {
display:block;
font-weight:500;
color: #663300;
height:20px;
line-height:15px;
background-image: url("http://www.lisabs.ca/images/layout2/dropdown_itembg.gif");
padding: 7px 4px 0px 15px;
width:181px;
}

.menu1 ul li:hover ul li a.drop {
background:#ccd url(images/bullet1.gif) no-repeat 3px 8px;
}
.menu1 ul li:hover ul li a:hover {
background-image: url("http://www.lisabs.ca/images/layout2/dropdown_itembg_hover.gif");
}
.menu1 ul li:hover ul li a:hover.drop {

}
.menu1 ul li:hover ul li:hover ul {

}
.menu1 ul li:hover ul li:hover ul.left {
left:-153px;
}



/* specific to IE5.5 and IE6 browsers */
.menu1 ul li a:hover ul {
display:block;position:absolute;top:42px; border-bottom:4px solid #43260f; z-index:2; overflow:visible
}

.menu1 ul li a:hover ul.endstop {
left: -93px;
}
.menu1 ul li a:hover ul li a {
	display:block;
	background-image: url("http://www.lisabs.ca/images/layout2/dropdown_itembg.gif");
	color:#000; 
	height:20px; 
	line-height:15px; 
	padding: 7px 4px 0px 15px;
	width:180px;  
}
.menu1 ul li a:hover ul li a.drop {
padding-bottom:4px;
}
.menu1 ul li a:hover ul li a ul {
visibility:hidden; position:relative; height:0; width:0;
}
.menu1 ul li a:hover ul li a:hover {
background-image: url("http://www.lisabs.ca/images/layout2/dropdown_itembg_hover.gif");
}
.menu1 ul li a:hover ul li a:hover.drop {

}
.menu1 ul li a:hover ul li a:hover ul {
visibility:visible; position:relative; top:0;color:#000; left:153px;
}
.menu1 ul li a:hover ul li a:hover ul.left {
left:-153px;
}
</style>

<!--[if lte IE 5.5]>
<style type="text/css">
.menu1 ul li a, .menu1 ul li a:visited {height:33px;}
</style>
<![endif]-->