function hideGenomeColumns () {
  var tab = document.getElementById( 'summaryTable' );
  var tdList = tab.getElementsByTagName( 'td' );
  for( var i=0; i<tdList.length; i++ ) {
    var spl = tdList[i].className.split(' ');
    for( var j=0; j<spl.length; j++ ) {
      if( spl[j] == 'chrCol' ) {
        tdList[i].style.display = 'none';
      }
    }
  }
}