html {margin: 0; padding: 0; overflow:hidden; height: 100%; width: 100%; background-color:#fff;} 

body {margin: 0; padding: 0; overflow:hidden; height: 100%; width: 100%; background-color:#fff; background-image: url(bgIntro.gif); background-position:center left; } 
#contentArea { position:absolute; top:50% ; left:50%; height:330px; margin-top:-165px; margin-left:-450px; width:900px; background-color:#fff;}