function NewsLetter()
{
	window.open("mailisttxt/teste.php","newslt","width=560,height=155,top=20,left=20,resizable=0,scrollbars=0");
}

function checkMail(field)
{
	var x = field.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	if (filter.test(x))
	{
		return true;
		//alert('YES! Correct email address');
	} else
	{
		alert('Invalid mail address.');
	}
}