function toggle(id)  
{  
   var itm = null;  
   if (document.getElementById){  
       itm = document.getElementById(id);  
   }else if (document.all){  
       itm = document.all[id];  
   }else if (document.layers){  
       itm = document.layers[id];  
   }
   
   if (!itm){  
       // do nothing  
   } else if (itm.style){ 
       if (itm.style.display == "none"){  
           itm.style.display = "";   
       }else{  
           itm.style.display = "none";
       }  
   }else{  
       itm.visibility = "show";
   }  
}