/* for flipping a div on or off */
function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

/* for flipping the image on share dropdown */
function toggleImage( id ) 
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( id );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[id];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[id];
  vis = elem.style;
  if ( vis.backgroundImage == '' || vis.backgroundImage.indexOf('expand.gif') != -1 )
    vis.backgroundImage = "url('images/contract.gif')";
  else
    vis.backgroundImage = "url('images/expand.gif')";      
}