HTML CSS Drop down menu changed to drop up menu

        body { font-family:Arial, Helvetica, Sans-Serif; font-size:12px; margin:0px 20px;}
        /* menu */
        #menu{ margin:0px; padding:0px; list-style:none; color:#fff; line-height:45px; display:inline-block; float:left; z-index:10000; }
        #menu a { color:#fff; text-decoration:none; }
        #menu > li {background:#172322 none repeat scroll 0 0; cursor:pointer; float:left; position:relative;padding:0px 10px; margin:0px;}
        #menu > li a:hover {color:#B0D730;}
        #menu .logo {background:transparent none repeat scroll 0% 0%; padding:0px; background-color:Transparent;}
        /* sub-menus*/
        #menu ul { padding:0px; margin:0px; display:block; display:inline;}
        #menu li ul { position:absolute; left:-10px; top:0px; margin-top:45px; width:150px; line-height:16px; background-color:#172322; color:#0395CC; /* for IE */ display:none; }
        #menu li:hover ul { display:block;}
        #menu li ul li{ display:block; margin:5px 20px; padding: 5px 0px;  border-top: dotted 1px #606060; list-style-type:none; }
        #menu li ul li:first-child { border-top: none; }
        #menu li ul li a { display:block; color:#0395CC; }
        #menu li ul li a:hover { color:#7FCDFE; }
        /* main submenu */
        #menu #main { left:0px; top:-20px; padding-top:20px; background-color:#7cb7e3; color:#fff; z-index:9999;}
        /* search */
        .searchContainer div { background-color:#fff; display:inline; padding:5px;}
        .searchContainer input[type="text"] {border:none;}
        .searchContainer img { vertical-align:middle;}
        /* corners*/
        #menu .corner_inset_left { position:absolute; top:0px; left:-12px;}
        #menu .corner_inset_right { position:absolute; top:0px; left:150px;}
        #menu .last { background:transparent none repeat scroll 0% 0%; margin:0px; padding:0px; border:none; position:relative; border:none; height:0px;}
        #menu .corner_left { position:absolute; left:0px; top:0px;}
        #menu .corner_right { position:absolute; left:132px; top:0px;}
        #menu .middle { position:absolute; left:18px; height: 20px; width: 115px; top:0px;}

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I have CSS for an HTML drop down menu that would usually go in the upper right hand side of the window.  

I need to move it to the bottom left of the screen.  What do I need to change in the CSS to get the menus to drop-up instead of down off the screen?