function el(id) {
		if (document.getElementById){
			// this is the way the standards work
			return document.getElementById(id);
		}else if (document.all){
			// this is the way old msie versions work
			return document.all[id];
		}else if (document.layers){
		// this is the way nn4 works
			return document.layers[id];
		}else if (window[id]){
			return window[id];
		}
     return null;
   }
   function show(id){
      var element = el(id);
      if (element){
         element.style.display='block';
      }
      return null;
   }
   function hide(id){
      var element = el(id);
      if (element){
         element.style.display='none';
      }
      return null;
   }