function hideDiv(divid){
    if(document.getElementById(divid).style.visibility == 'hidden'){
      document.getElementById(divid).style.visibility = 'visible';
    }else{
      document.getElementById(divid).style.visibility = 'hidden';
    }
  }
  function showDiv(divid){
    if(document.getElementById(divid).style.visibility == 'visible'){
      document.getElementById(divid).style.visibility = 'hidden';
    }else{
      document.getElementById(divid).style.visibility = 'visible';
    }
  }