function toggle_section ( x ) {
   for ( i = 1; i <= 3; i ++ ) {
      z=document.getElementById ("action" + i).style;
      if ( i == x ) {
         z.display = (z.display == 'none') ? ( 'inline' ) : ( 'none' );
         z.visibility = (z.visibility=='hidden') ? ('visible') : ('hidden');
         if ( i == 1 ) {
            if ( z.display == 'none' )
               imgedu.src='/images/greenright.jpg';
            else
               imgedu.src='/images/greendown.jpg';
         }
         else if ( i == 2 ) {
            if ( z.display == 'none' )
               imginfra.src='/images/greenright.jpg';
            else
               imginfra.src='/images/greendown.jpg';
         }
         else if ( i == 3 ) {
            if ( z.display == 'none' )
               imghousing.src='/images/greenright.jpg';
            else
               imghousing.src='/images/greendown.jpg';
         }
      }
      else {
         z.display = 'none';
         z.visibility = 'hidden';
      }
   }
}