Second Javascript

I've added the last piece of javascript to the site. It's a simple form validation for email addresses in the contact form.

Code Snippet: 

<script>

function validateForm()

{

var x=document.forms["contactForm"]["email"].value;

var atpos=x.indexOf("@");

var dotpos=x.lastIndexOf(".");

if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)

  {

  alert("Not a valid e-mail address");

  return false;

  }

}

</script>

All the code is done through internal javascript in the header.

A tutorial was used from w3 schools.