JavaScript

// JavaScript Document
function formValidation()
{
var uid = document.registration.userid;
var uname = document.registration.username;
var uadd = document.registration.address;
var uzip = document.registration.zip;
var uemail = document.registration.email;
if(userid_validation(uid))
  {
    if(allLetter(uname))
    {
      if(alphanumeric(uadd))
      {
        if(allnumeric(uzip))
        {
          if(ValidateEmail(uemail))
          {
        }
      }
    }
  }
return false;
}
function userid_validation(uid)
{
var letters = /^[A-Za-z]+$/;
var uid_len = uid.value.length;
  if (uid.value.match(letters))
    {
    return true;
    }
    else
    {
    alert("The First Name can not be empty/must         contain only letters");
    uid.focus();
   return false;
  }
}
function allLetter(uname)
{
var letters = /^[A-Za-z]+$/;
  if (uname.value.match(letters))
  {
   return true;
  }
  else
  {
  alert("The Last Name can not be empty/must  contain only letters");
  uname.focus();
  return false;
  }
}
function alphanumeric(uadd, num)
{
var uadd_len = uadd.value.length;
var numbers = /^[0-9]+$/;
if (uadd.value.match(numbers))
  {
  return true;
  }
  else
  {
  alert("Your phone number must have a 10 digits all numbers");
  uadd.focus();
  return false;
  }
}
function allnumeric(uzip)
{
var numbers = /^[0-9]+$/;
  if (uzip.value.match(numbers))
  {
  return true;
  }
  else
  {
  alert("You must fill in your ZIP code with five numeric characters");
  uzip.focus();
  return false;
  }
}
function ValidateEmail(uemail)
{
var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
  if(uemail.value.match(mailformat))
  {
  alert("Form Succesfully Submitted");
  window.location.reload();
  return true;
  }
  else
  {
  alert("You have entered an invalid email address!");
  uemail.focus();
  return false;
  }

}