var sUserAgent = new String(navigator.userAgent); 
var nWidth = 780;
if (sUserAgent.indexOf("Gecko")!=-1){
    nWidth = 790;
}
document.write('  <div style="padding-top:0px;padding-left:0px>');
document.write('      <a href="http://iip.uoc.edu" target="_blank"><img src="../img/logo_uocth.jpg"  width="'+nWidth+'px" border="0"></a>');
document.write('  </div>');