Div Coding.. Please Help ! (Pushing my Myspace page down w Banner)

im ALMOST there…

oughh this is so aggrivating … can somone please tell me what to change to get this banner below the google search, and ads on myspace. just above the menu ??

heres what i have so far, and the banner shows up on the very top.

                body{ background-position:top center;margin-top: 302 ;}
                div.topbanner {
                top: 0;
                left: 50%;
                margin-left: -400px; 
                vertical-align: bottom
                width: 800px;
                height: 302px;
                position: absolute;
               <div class="topbanner"><img src="http://lovelesscreations.com/flyers/ga_banner.png" /></div>