function mailformat()
{
	var theValue = document.getElementById("txtEmail");
	myregexp = new RegExp("([a-zA-Z0-9-.]+\@[a-zA-Z0-9-]+[.]+[a-zA-Z0-9-.]+)");
	
	if (!theValue.value.match(myregexp))
	{
		alert("Please type a valid e-mail address...");
		theValue.focus();
		return false;
	}
}