function openClose(id) {
  var obj="";
  // Check browser compatibility
  if(document.getElementById)
    obj=document.getElementById(id).style;
  else if(document.all)
    obj=document.all[id];
  else if(document.layers)
    obj=document.layers[id];
  else
    return 1;

  // Do the magic :)
  if(obj.display=="")
    obj.display="none";
  else if(obj.display!="none")
    obj.display="none";
  else
    obj.display="block";
}