menu orizzontale drop-down

[gordon]

Ho trovato questo menù orizzontale che sto personalizzando a piacimento.
http://www.cssplay.co.uk/menus/pro_drop3.html

Vorrei però che i menù si aprissero verso l'alto e non verso il basso.

Cosa modificare?

Ecco il css
codice:

.preload1 {background: url(drop3/blank_over.gif);}
.preload2 {background: url(drop3/blank_overa.gif);}

.menu2 {padding:0 0 0 32px; margin:0; list-style:none; height:36px; background:#fff; position:relative; z-index:500; font-family:arial, verdana, sans-serif;}
.menu2 li.top {display:block; float:left;}
.menu2 li a.top_link {display:block; float:left; height:36px; line-height:27px; color:#ccc; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;background: url(drop3/blank.gif);}
.menu2 li a.top_link span {float:left; display:block; padding:0 24px 0 12px; height:36px;background:url(drop3/blank.gif) right top;}
.menu2 li a.top_link span.down {float:left; display:block; padding:0 24px 0 12px; height:36px; background:url(drop3/blanka.gif) no-repeat right top;}
.menu2 li a.top_link:hover {color:#fff; background: url(drop3/blank_over.gif) no-repeat;}
.menu2 li a.top_link:hover span {background:url(drop3/blank_over.gif) no-repeat right top;}
.menu2 li a.top_link:hover span.down {background:url(drop3/blank_overa.gif) no-repeat right top;}

.menu2 li:hover > a.top_link {color:#fff; background: url(drop3/blank_over.gif) no-repeat;}
.menu2 li:hover > a.top_link span {background:url(drop3/blank_over.gif) no-repeat right top;}
.menu2 li:hover > a.top_link span.down {background:url(drop3/blank_overa.gif) no-repeat right top;}


.menu2 table {border-collapse:collapse; width:0; height:0; position:absolute; top:0; left:0;}

/* Default link styling */

/* Style the list OR link hover. Depends on which browser is used */

.menu2 a:hover {visibility:visible; position:relative; z-index:200;}
.menu2 li:hover {position:relative; z-index:200;}

/* keep the 'next' level invisible by placing it off screen. */
.menu2 ul, 
.menu2 :hover ul ul, 
.menu2 :hover ul :hover ul ul,
.menu2 :hover ul :hover ul :hover ul ul,
.menu2 :hover ul :hover ul :hover ul :hover ul ul {position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

.menu2 :hover ul.sub {left:0; top:31px; background: #fff; padding:3px; border:1px solid #3a93d2; white-space:nowrap; width:90px; height:auto; z-index:300;}
.menu2 :hover ul.sub li {display:block; height:20px; position:relative; float:left; width:90px; font-weight:normal;}
.menu2 :hover ul.sub li a {display:block; font-size:11px; height:20px; width:90px; line-height:20px; text-indent:5px; color:#000; text-decoration:none;}
.menu2 :hover ul.sub li a.fly {background:#fff url(drop3/arrow.gif) 80px 7px no-repeat;}
.menu2 :hover ul.sub li a:hover {background:#3a93d2; color:#fff;}
.menu2 :hover ul.sub li a.fly:hover {background:#3a93d2 url(drop3/arrow_over.gif) 80px 7px no-repeat; color:#fff;}
.menu2 :hover ul li:hover > a.fly {background:#3a93d2 url(drop3/arrow_over.gif) 80px 7px no-repeat; color:#fff;} 

.menu2 :hover ul :hover ul,
.menu2 :hover ul :hover ul :hover ul,
.menu2 :hover ul :hover ul :hover ul :hover ul,
.menu2 :hover ul :hover ul :hover ul :hover ul :hover ul
{left:90px; top:-4px; background: #fff; padding:3px; border:1px solid #3a93d2; white-space:nowrap; width:90px; z-index:400; height:auto;}