var name = prompt("Customize this page..\nTell me your name", "Type your name here");

if (name == "Type your name here" || name == "")
   {
   name = "dear visitor, you didn't specify your name.";
   }

function disp_al()
   {
   var name = prompt("What is your name", "Type you name here");
   alert("Hi " + name + "\nHope you are enjoying JavaScript!");
   }

function c_no()
{
var n = prompt("Check your number", "Type your number here");

n = parseInt(n);

if (n == 0)
   {
   alert(n + ": The number is zero");
   }
else if (n%2)
   {
   alert(n + ": The number is odd");
   }
else
   {
   alert(n + ": The number is even");
   }
}

function c_no1()
{
var n = prompt("Check your number", "Type your number here");
n = parseInt(n);
if (isNaN(n))
   {
   alert("The input cannot be parsed to a number");
   }
else
   {
   if (n == 0)
      {
      alert("The number is zero");
      }
   else if (n%2)
      {
      alert("The number is odd");
      }
   else
      {
      alert("The number is even");
      }
   }
}