var active="";
var activeSub="";

function showMenu(menuName) {
  if(document.getElementById) {
    hideMenu();
    document.getElementById(menuName).style.display="block";
    active=menuName;
  }
}

function hideMenu() {
  if(document.getElementById) {
    hideSubMenu();
    if(active!="") {
      document.getElementById(active).style.display="none";
    }
  }
}

function showSubMenu() {
  if(document.getElementById) {
    document.getElementById('programs').style.display="block";
    activeSub="programs";
  }
}

function hideSubMenu() {
  if(document.getElementById) {
    if(activeSub!="") {
      document.getElementById(activeSub).style.display="none";
    }
  }
}

function ieMenus() {
  if(navigator.appName=="Microsoft Internet Explorer") {
    document.all.teachers.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
    document.all.parents.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
    document.all.students.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
    document.all.contributors.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
    document.all.aboutus.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
    document.all.programs.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=95)progid:DXImageTransform.Microsoft.Shadow(Color='#666666', direction=135, strength=3)";
  }
}