function switchDiv1(n)
{ 
var id;
  switch(n)
  {
    case 0:
         id = "";
         break;
    case 1:
         id = "page1";
         break;
    case 2:
         id = "page2";
         break;
	case 3:
         id = "page3";
         break;
  } 
  document.getElementById('page1').style.display = "none";
  document.getElementById('page2').style.display = "none";
  document.getElementById('page3').style.display = "none";
  
  if (id!="")
     document.getElementById(id).style.display = "block";
}