popMenus = new Array('rrcna','reading_recovery','training','conferences','implementation','research');

function popShow(menu) {
  if (document.all) {
    document.all[menu+'Pop'].style.visibility = 'visible';
  } else if (document.getElementById) {
    document.getElementById(menu+'Pop').style.visibility = 'visible';
  }
  popHide(menu);
}

function popHide(menu) {
  for (n=0; n<popMenus.length; n++) {
    if (popMenus[n] != menu) {
      if (document.all) {
        document.all[popMenus[n]+'Pop'].style.visibility = 'hidden';
      } else if (document.getElementById) {
        document.getElementById(popMenus[n]+'Pop').style.visibility = 'hidden';
      }
    }
  }
}

function rollOver(button) {
  if (document.all) {
    document.all[button].className = 'navOver';
  } else if (document.getElementById) {
    document.getElementById(button).className = 'navOver';
  }
}

function rollOut(button) {
  if (document.all) {
    document.all[button].className = 'navOut';
  } else if (document.getElementById) {
    document.getElementById(button).className = 'navOut';
  }
}