function swap ( section, type, path ) {
   if ( document.images ) {
      var buttonimage = new Image();
      if ( type == 'over' ) {
         buttonimage.src = path + 'images/nav_' + section + '_over.gif';
      }

      else {
         buttonimage.src = path + 'images/nav_' + section + '.gif';
      }

      navitem = document.getElementById ( section );
      navitem.src = buttonimage.src;
   }
}