1 function expand_track(tid)

     2 {

     3   var div = document.getElementById('track_inner_' + tid);

     4   if ( div.style.display == 'block' )

     5   {

     6     div.style.display = 'none';

     7   }

     8   else

     9   {

    10     div.style.display = 'block';

    11   }

    12 }

    13