.menu {
z-index:1000;
font-weight: bold;
font-family: "Arial CE", "Helvetica CE", Arial, helvetica, sans-serif;
font-size: 12px;
margin:0px 0 0px 0px;
}
.menu ul {
padding:0;
margin:0;
list-style-type:none;
width:180px;
}
* html .menu ul {margin-left:-16px; margin-left:0;}
.menu li {
position:relative;
background:#999 url(img/main_btn_a.png) no-repeat;
height:26px;
}
.menu table {position:absolute; border-collapse:collapse; top:0; left:0; z-index:100; font-size:1em;}
.menu a, .menu a:visited {
display:block; 
text-decoration:none;
height:25px;
line-height:25px;
width:179px;
color:#000;
text-indent:20px;
border:1px solid WhiteSmoke;
border-width:0 0px 1px 0;
}
* html .menu a, * html .menu a:visited {background:#999 url(img/main_btn_a.png) no-repeat; width:180px; width:179px;}
* html .menu a:hover {color: #555;text-decoration: none; background:transparent; background-image: url(img/main_btn_b.gif);}

.menu :hover > a {
color: #555; 
text-decoration: none;
background:#999 url(img/main_btn_b.gif) no-repeat;
}
.menu ul ul {
visibility:hidden;
position:absolute;
top:0;
left:180px; 
}
.menu ul li:hover ul,
.menu ul a:hover ul {
visibility:visible;
}
.menu ul :hover ul ul{
visibility:hidden;
}
.menu ul :hover ul :hover ul ul{
visibility:hidden;
}
.menu ul :hover ul :hover ul{ 
visibility:visible;
}
.menu ul :hover ul :hover ul :hover ul { 
visibility:visible;
}