function toggle(obj1,obj2){  
  var more=document.getElementById(obj1);  
  var less=document.getElementById(obj2);
  if(!more)return true;  
  if(more.style.display=="none"){  
    more.style.display="block";
    less.style.display="none";
  } else {  
    more.style.display="none";
    less.style.display="block";
  }
  return true;  
}