function checkMail(ele)
{
	var x = ele.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	
	// only test if something is entered
	if (x != "")
	{
		if (filter.test(x))
		{
			//alert('YES! Correct email address');
		}
		else
		{
			alert('The email address entered does not appear to be valid - please check!');
		}
	}
}