/*
	Returns true if a string contains
	only digits 
*/
function isEmail ( str, allowBlank ) {
	if ( (str.length < 1) && (allowBlank == true) ) return true;
	if ( (str.length < 1) && (allowBlank == false) ) return false;
	re = /^([A-Za-z0-9\._%\-]+@[A-Za-z0-9\-\.\_]+\.(com|org|net|biz|info|name|jobs|museum|name|ca|uk))$/i;
	return re.test( str );
}