function switchTopTab(type)
 {
  if (type == "teacher")
   {
    document.getElementById("teachertab").style.backgroundPosition = "0px 0px";
    document.getElementById("schooltab").style.backgroundPosition = "0px -34px";
    
    document.getElementById("topschool").style.display = "none";
    document.getElementById("topteacher").style.display = "block";
   }
   
  else if (type == "school")
   {
    document.getElementById("schooltab").style.backgroundPosition = "0px 0px";
    document.getElementById("teachertab").style.backgroundPosition = "0px -34px";
    
    document.getElementById("topteacher").style.display = "none";
    document.getElementById("topschool").style.display = "block";
   }
 }