tooltip = null;  
      document.onmousemove = updateTooltip;  
      
      function updateTooltip(e) {  
        try {  
          x = (document.all) ? window.event.x + document.documentElement.scrollLeft: e.pageX;  
          y = (document.all) ? window.event.y + document.documentElement.scrollTop: e.pageY;  
          if (tooltip != null) {  
           tooltip.style.left = (x + 20) + "px";  
           tooltip.style.top = (y + 20) + "px";  
         }  
       } catch (error) { error=null; }  
     }  
     
     function showTooltip(id) {  
       try {  
         tooltip = document.getElementById(id);  
         tooltip.style.display = "block"  
       } catch (error) { error=null; }  
     }  
     
     function hideTooltip() {  
       try {  
         tooltip.style.display = "none";  
       } catch (error) { error=null; }  
     }