/**
  * Tests if $node has prev sibling
  *
  * @param      sfAssetFolder $node		Propel object for node
  * @param      PropelPDO $con		Connection to use.
  * @return     bool
  */
 public static function hasPrevSibling(NodeObject $node, PropelPDO $con = null)
 {
     return sfAssetFolderPeer::isValid(sfAssetFolderPeer::retrievePrevSibling($node, $con));
 }