function adBox()
{
    contentSize = 710;

    midden = ((document.documentElement['offsetWidth'] -2)/2 - 80);

    document.getElementById('centerrechts').style.left    = ((document.documentElement['offsetWidth']/2) + (contentSize /2)) + "px";
    document.getElementById('centerrechts').style.display = 'block';
}
function addEvent( obj, type, fn )
{
   if (obj.addEventListener)
      obj.addEventListener( type, fn, false );
   else if (obj.attachEvent)
   {
      obj["e"+type+fn] = fn;
      obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
      obj.attachEvent( "on"+type, obj[type+fn] );
   }
}

addEvent(window, "resize", adBox);
adBox();