function toggleDiv(whichLayer) {
  if (document.getElementById) {  // this is the way the standards work
    var style2 = document.getElementById(whichLayer).style;
    style2.display = style2.display ? '' : 'block';
    }
  else if (document.all) {  // this is the way old msie versions work
    var style2 = document.all[whichLayer].style;
    style2.display = style2.display ? '' : 'block';
    }
  else if (document.layers) { // this is the way nn4 works
    var style2 = document.layers[whichLayer].style;
    style2.display = style2.display ? '' : 'block';
    }
  }