function checkSel( x )
{
   var arr = new Array( 0, 1, 3, 0,
                        1, 2, 4, 5,
                        6, 9, 1, 11 );

   if( document.form1.elements[ x ].selectedIndex == ( arr[ x ] + 1 ) )
   {
      alert( "You are correct!" );
   }
   else
   {
      alert( "Sorry.  Please try again." );
   }
}