function showHide(element) {
  if (document.getElementById) {
    // W3C standard
    var style2 = document.getElementById(element).style;
    style2.display = style2.display ? "" : "block";
  }
  else if (document.all) {
    // old MSIE versions
    var style2 = document.all[element].style;
    style2.display = style2.display ? "" : "block";
  }
  else if (document.layers) {
    // Netscape 4
    var style2 = document.layers[element].style;
    style2.display = style2.display ? "" : "block";
  }
}