function showdivDisplay(divID,items) {
  for(var i = 1; i <= items; i++) {
     var mydiv = document.getElementById("t" + i);
     mydiv.style.visibility="";
     mydiv.style.display="none";
  }

   var mydiv2 = document.getElementById(divID);

   mydiv2.style.visibility="";
   mydiv2.style.display="";
}