position:fixed ie6 hack problem

<!--[if lt IE 7]><style type="text/css">
 @media screen {
   html, body {
     height: auto; overflow-y: hidden;
   }
   #content_fix {
    height: auto; width: 100%; overflow: auto; padding-top:0px;
   }

#header_fix {
right: 0;
height: 170px;
position: static;
background-color:#FFFFFF;
}
 }

</style><![endif]-->