function isValid(obj)
{
  if (obj != '' && obj != null && obj!= 'undefined')
    return true;
  else
    return false;
}

function shareOnFacebook(artworkId)
{
	var u = Application_DefaultPage + '?pg=Artwork&itemKey=' + artworkId;
  var t = document.title + document.description;
  
  window.open('http://www.facebook.com/sharer.php?u=' + encodeURIComponent(u) + '&t=' + encodeURIComponent(t),
	              'sharer', 'toolbar=0, status=0, width=626, height=436');  
  
  return false;
  
}