var dom = (document.getElementById && !document.all)? 1: 0;

function expand(the_id)
{
  var obj = (dom)? document.getElementById(the_id): document.all[the_id];

 if(obj.style.visibility == "hidden"){
     obj.style.visibility = "visible";
     obj.style.display = "block";
 }
 else { // hide
     obj.style.visibility = "hidden";
     obj.style.display = "none";
 }
}