var Validator = {
	isEmail : function(s) {
		return this.test(s, '^([a-zA-Z0-9_.-])+@([a-zA-Z0-9_.-])+\.([a-zA-Z])+([a-zA-Z])+');
	},

	isAbsUrl : function(s) {
		return this.test(s, '^(news|telnet|nttp|file|http|ftp|https)://[-A-Za-z0-9\\.]+\\/?.*$');
	},

	isSize : function(s) {
		return this.test(s, '^[0-9]+(px|%)?$');
	},

	isId : function(s) {
		return this.test(s, '^[A-Za-z_]([A-Za-z0-9_])*$');
	},

	isEmpty : function(s) {
		var nl, i;

		if (s.nodeName == 'SELECT' && s.selectedIndex < 1)
			return true;

		if (s.type == 'checkbox' && !s.checked)
			return true;

		if (s.type == 'radio') {
			for (i=0, nl = s.form.elements; i<nl.length; i++) {
				if (nl[i].type == "radio" && nl[i].name == s.name && nl[i].checked)
					return false;
			}

			return true;
		}

		return new RegExp('^\\s*$').test(s.nodeType == 1 ? s.value : s);
	},

	isNumber : function(s, d) {
		return !isNaN(s.nodeType == 1 ? s.value : s) && (!d || !this.test(s, '^-?[0-9]*\\.[0-9]*$'));
	},

	test : function(s, p) {
		s = s.nodeType == 1 ? s.value : s;

		return s == '' || new RegExp(p).test(s);
	}
};