function showHide() {
   if (document.getElementById("pop").style.visibility == "")  {
     document.getElementById("pop").style.visibility = "hidden";
   }
   
   if (document.getElementById("pop").style.visibility == "hidden")  {
      document.getElementById("pop").style.visibility = "visible" ;
   }
   else { 
	  document.getElementById("pop").style.visibility = "hidden" ;
   } 
}

function showHide2() {
   if (document.getElementById("pop2").style.visibility == "")  {
     document.getElementById("pop2").style.visibility = "hidden";
   }
   
   if (document.getElementById("pop2").style.visibility == "hidden")  {
      document.getElementById("pop2").style.visibility = "visible" ;
   }
   else { 
	  document.getElementById("pop2").style.visibility = "hidden" ;
   } 
}

function showHide3() {
   if (document.getElementById("pop3").style.visibility == "")  {
     document.getElementById("pop3").style.visibility = "hidden";
   }
   
   if (document.getElementById("pop3").style.visibility == "hidden")  {
      document.getElementById("pop3").style.visibility = "visible" ;
   }
   else { 
	  document.getElementById("pop3").style.visibility = "hidden" ;
   } 
}