function tuggle(ctrl,name){
  var obj =   document.getElementById(name);
  var visible = '';
  var pos = '';
  if(ctrl.src.indexOf('expand.gif') >= 0){
     ctrl.src = 'images/collapse.gif';
     visible = 'visible';
     pos = 'relative';
  }else{
     ctrl.src = 'images/expand.gif';
     visible = 'hidden';
     pos = 'absolute';    
  }
  if(obj != null){
     obj.style.visibility = visible;
     obj.style.position = pos;
  }
}