function toggle(divID)
{
  var div, visible;
  if(document.getElementById)
    div = document.getElementById(divID);
  else if(document.all) // MSIE
      div = document.all[divID];
  else if(document.layers) //  NN4
    div = document.layers[divID];
  visible = div.style;
  if(visible.display==''&&div.offsetWidth!=undefined&&div.offsetHeight!=undefined)
    visible.display = (div.offsetWidth!=0&&div.offsetHeight!=0)?'block':'none';
	visible.display = (visible.display==''||visible.display=='block')?'none':'block';
}