$.validator.addMethod("phone", function(phone_number, element) {
			var digits = "0123456789";
			var phoneNumberDelimiters = "()- ext.";
			var validWorldPhoneChars = phoneNumberDelimiters + "+";
			var minDigitsInIPhoneNumber = 10;
			s=stripCharsInBag(phone_number,validWorldPhoneChars);
			return this.optional(element) || isInteger(s) && s.length >= minDigitsInIPhoneNumber;
			}, "Please enter a valid phone number");

			function isInteger(s)
			{ var i;
			for (i = 0; i < s.length; i++)
			{
			// Check that current character is number.
			var c = s.charAt(i);
			if (((c < "0") || (c > "9"))) return false;
			}
			// All characters are numbers.
			return true;
			}
		function stripCharsInBag(s, bag)
		{ var i;
		var returnString = "";
		// Search through string's characters one by one.
		// If character is not in bag, append to returnString.
		for (i = 0; i < s.length; i++)
		{
		// Check that current character isn't whitespace.
		var c = s.charAt(i);
		if (bag.indexOf(c) == -1) returnString += c;
		}
		return returnString;
		}