function des()
{
var response = confirm("Have you understood the confirm box?");

if (response == true)
   {
   alert("Okay, let us continue");
   }
else
   {
   alert("Go thru the previous session again");
   }
}

function des2()
{
var n = "23";
if (n%2)
   {
   alert("Number is Odd");
   }
else
   {
   alert("Number is even");
   }
}