function checkEmail(form)
{
	var eml = form["email"].value;
	if (!eml)
	{
		alert('Please enter a correct email address');
		//form.email.focus();
		return false;
	}

	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(eml)) return true;

	alert('Please enter a correct email address');
	return false;
}