var whitespace = " \t\n\r";
var digits = "0123456789";

function isEmpty(s) {   
	return ((s == null) || (s.length == 0))
}

function isEmptyOrWhitespace (s) {   
	var i;
    if (isEmpty(s)) return true;
    for (i = 0; i < s.length; i++) {   
        var c = s.charAt(i);
        if (whitespace.indexOf(c) == -1) return false;
    }
    return true;
}

function isRadioSelected(radiofield) {   
	for (var i = 0; i < radiofield.length; i++) {   
		if (radiofield[i].checked) return true
    }
    return false
}

function isValidPhoneNumber(s) {
	var temp = s.replace(/\D/g, "")
	return temp.length > 9 && temp.length < 26
}