CSS from drop-down to drop-up menu

I have a css drop-down menu that is working - I want to make it a drop-up menu.  The code is below

Are someone able to help how I can make this a "drop-up" menu instead

/*Drop-down menu*/
.nav2 {float:left; width:900px; border:none; background:rgb(220,220,220) url(../img/bg_head_bottom_nav.jpg) no-repeat; color:rgb(75,75,75); font-size:130%;} /*Color navigation bar normal mode*/
.nav2 ul {list-style-type:none;}
.nav2 ul li {float:left; position:relative; z-index:auto !important /*Non-IE6*/; z-index:1000 /*IE6*/; border-right:solid 1px rgb(175,175,175);}
.nav2 ul li a {float:left; display:block; height:3.1em; line-height:3.1em; padding:0 16px 0 16px; text-decoration:none; font-weight:bold; color: rgb(100,100,100);}
.nav2 ul li ul {display:none; border:none;}

/*Non-IE6 hovering*/
.nav2 ul li:hover a {background-color:rgb(210,210,210); text-decoration:none;} /*Color main cells hovering mode*/
.nav2 ul li:hover ul {display:block; width:10.0em; position:absolute; z-index:999; top:3.0em; margin-top:0.1em; left:0;}
.nav2 ul li:hover ul li a {display:block; width:10.0em; height:auto; line-height:1.3em; margin-left:-1px; padding:4px 16px 4px 16px; border-left:solid 1px rgb(175,175,175); border-bottom: solid 1px rgb(175,175,175); background-color:rgb(237,237,237); font-weight:normal; color:rgb(50,50,50);} /*Color subcells normal mode*/
.nav2 ul li:hover ul li a:hover {background-color:rgb(210,210,210); text-decoration:none;} /*Color subcells hovering mode*/

/*IE6 hovering*/
.nav2 table {position:absolute; top:0; left:0; border-collapse:collapse;}
.nav2 ul li a:hover {background-color:rgb(210,210,210); text-decoration:none;} /*Color main cells hovering mode*/
.nav2 ul li a:hover ul {display:block; width:10.0em; position:absolute; z-index:999; top:3.1em; t\op:3.0em; left:0; marg\in-top:0.1em;}
.nav2 ul li a:hover ul li a {display:block; w\idth:10.0em; height:1px; line-height:1.3em; padding:4px 16px 4px 16px; border-left:solid 1px rgb(175,175,175); border-bottom: solid 1px rgb(175,175,175); background-color:rgb(237,237,237); font-weight:normal; color:rgb(50,50,50);} /*Color subcells normal mode*/
.nav2 ul li a:hover ul li a:hover {background-color:rgb(210,210,210); text-decoration:none;} /*Color subcells hovering mode*/
rossonerisAsked:
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xberryCommented:
Please refer to this one:
http://www.cssplay.co.uk/menus/final_pullup.html
(right mouseclick --> source code to see how it is implemented)

-- and don't forget to include the copyright of that great guy ; - ))
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