function divChange(str_disp,str_hidden1,str_hidden2)
{
   var disp = document.getElementById(str_disp+"_div");
   var hidden1 = document.getElementById(str_hidden1+"_div");
   var hidden2 = document.getElementById(str_hidden2+"_div");

   
   disp.style.display = "block";
   hidden1.style.display = "none";
   hidden2.style.display = "none";
}