function validate_email(strng)
{
	var emailFilter=/^.+@.+\..{2,3}$/;
	var strEmail=strng.value;

	if (!(emailFilter.test(strEmail))) {
		alert("Please enter a valid email address.");
		strng.focus();
		strng.select();
		return false;
	}
	return true;
}

function checkForm()
{
	if(document.newsletter.first_name.value==""){
		alert('Please enter your name');
		document.newsletter.first_name.focus();
		return false;
	}

	if(!validate_email(document.newsletter.email_address))
	{
	return false;
  }

	return true;
}