[css-d] Need Help with CSS Table 3 column

[ecssl]

I am using the code from:

http://www.glish.com/css/3.asp to create a centered, fixed 3 column table.

How do I create an even bottom edge?

This is what I have so fa:

http://www.utahredrockcanyonmotorcycletours.com/css3col.html

here is my style sheet:

body {
                
                background-image: url(images/bg3.gif) ;
                background-repeat: repeat;
                }
                
a       {
        color: Blue;
        font-family: Arial, Helvetica, Sans-Serif;
        font-size: 90%;
        font-weight: bold;
        line-height: 20%;
        text-decoration: underline;
        }
                
        
        #frame {
                width:927px;
                margin-right:auto;
                margin-left:auto;
                margin-top:20px;
                padding:0px;
                text-align:center;
                }
                
        #contentleft {
                width:175px;
                margin-left:10px;
                padding:5px;
                float:left;
                background:#f5deb3;
                text-align: left;
                }
        
        #contentcenter {
                width:482px;
                padding:5px;
                float:left;
                background:#f5deb3;
                }
        
        #contentright {
                width:240px;
                padding:0px;
                float:left;
                background:#f5deb3;
                float:center;
                }
        
        #contentheader {
                background:#fff
                }
                
        p,h1,pre {
                margin:0px 10px 10px 10px;
                }
                
        h1 {
                font-size:16pt;
                padding-top:10px;
                font-family: Arial, Helvetica, Sans-Serif;
                font-weight: bold;
                text-align: center;
                }
                
        #contentheader h1 {
                font-size:14px;
                padding:10px;
                margin:0px;
                }
        
        #contentright p { font-size:10px}

It looks different in Firefox than it does in my html editor as well.

Thanks
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