#menu {
z-index:1000;
font-size:10pt;
font-family: Verdana, Arial, Helvetica, sans-serif; 
font-weight:bold;
color:#FFFFFF;
}

/* remove all the bullets, borders and padding from the default list styling */
#menu ul {
padding:0;
margin:0;
list-style-type:none;
width:300px;
height:auto;
min-height:250px;
_height:250px;
background:transparant;
background-image: url(../images/trans.gif);
background-repeat: no-repeat;
}
/* hack for IE5.5 */
* html #menu ul {margin-left:-16px; margin-left:0;}

/* position relative so that you can position the sub levels */
#menu li {
position:relative;
/*height:20px;*/
width:150px;
}

/* get rid of the table */
#menu table {position:absolute; border-collapse:collapse; top:0; left:0; z-index:100; font-size:1em; width:0; height:0;}

/* style the links */
#menu a, #menu a:visited {
display:block; 
text-decoration:none;
/*height:20px;*/
line-height:20px;
width:150px;
color:#fff;
/*text-indent:5px;*/
background:#545454;
}
/* hack for IE5.5 */
* html #menu a, * html #menu a:visited {background:#545454; width:150px;}

/* style the link hover */
* html #menu a:hover {color:#000000; background:#FFFFFF;}
#menu :hover > a {
color:#000000; 
background:#FFFFFF;
}

/* hide the sub levels and give them a positon absolute so that they take up no room */
#menu ul ul {
visibility:hidden;
position:absolute;
top:0;
left:150px; 
}
/* make the second level visible when hover on first level list OR link */
#menu ul li:hover ul,
#menu ul a:hover ul {
visibility:visible;
}

/* keep the third level hidden when you hover on first level list OR link */
#menu ul :hover ul ul{
visibility:hidden;
}
/* keep the fourth level hidden when you hover on second level list OR link */
#menu ul :hover ul :hover ul ul{
visibility:hidden;
}
/* keep the 5de level hidden when you hover on second level list OR link */
#menu ul :hover ul :hover ul :hover ul ul{
visibility:hidden;
}
/* keep the 5de level hidden when you hover on second level list OR link */
#menu ul :hover ul :hover ul :hover ul :hover ul ul{
visibility:hidden;
}

/* make the third level visible when you hover over second level list OR link */
#menu ul :hover ul :hover ul{ 
visibility:visible;
}
/* make the fourth level visible when you hover over third level list OR link */
#menu ul :hover ul :hover ul :hover ul { 
visibility:visible;
}
/* make the 5de level visible when you hover over third level list OR link */
#menu ul :hover ul :hover ul :hover ul :hover ul { 
visibility:visible;
}
/* make the 6de level visible when you hover over third level list OR link */
#menu ul :hover ul :hover ul :hover ul :hover ul :hover ul { 
visibility:visible;
}

<!--[if IE 7]-->
#menu li {float:left;}
<!--[endif]-->