function hide_class(classToHide)
 {
  if (!document.getElementsByTagName) return;
  var anchors = document.getElementsByTagName('*');
  for (var i=0; i<anchors.length; i++)
   {
    var anchor = anchors[i];
    if (anchor.getAttribute('class') == classToHide)
      anchor.style.display='none';
   }
 }
window.onload = hide_class('slide');