function showhide(what){
  var elm = document.getElementById(what);
  if (elm) { // IE 6, Mozilla
     elm.style.display = elm.style.display=="none" ? "" : "none";
  } else { // try IE 4-5, maybe others (?)
     eval(what+'.style.display = '+what+'.style.display=="none" ? "" : "none"');
  }
}

function popup(u,w,h,s,extra) {
  if (extra) { extra = ","+extra; } else { extra = ""; }
  var popup = window.open(u,'popup','toolbar=no,location=no,directories=no,status=no,scrollbars=' + s + ',menubar=no,titlebar=no,width=' + w + ',height=' + h +
 extra);
  popup.focus();
}