Validate Passport Number - taken from http://www.highprogrammer.com/alan/numbers/mrp.html

Valid8Passport.js

				function _validate_passport( passport ) {

					//Utils._strict( [ String ], arguments ); // Thirdparty Function

					//trim
					passport = passport.replace( /(^\s+|\s+$)/g, '' ); 

					var passport_characters = passport.split('');

					if( passport_characters.length == 9 ) {

						// Go straight to encoding

					} else if (passport_characters.length < 9 ) {

						// add padding
						var padding_length = 9 - (passport_characters.length);

						for (var i = 0; i < padding_length; i++) {
							
							passport_characters.push('<');

						};

					} else {

						throw "Please ensure you've provided a valid passport number, which should be 9 characters or less.";

					}

					var checksum 		= 0;
					var intRegex 		= /^\d+$/; // test for integer
					var encoding_data	= _generate_encoding_data();

					var encoding_data_length = encoding_data.length;

					// Passport Number has 9 characters...consisting of A-Z | 0-9

					for ( var i = 0; i < 10; i++ ) {

						if( passport_characters[i] === undefined ) {} else {

							switch(i) {

								case 0:
								case 3:
								case 6:
								case 9:

									// value * weight 7

									checksum = _calculate_checksum( passport_characters[i], checksum, 7 );

									break;

								case 1:
								case 4:
								case 7:

									// value * weight 3

									checksum = _calculate_checksum( passport_characters[i], checksum, 3 );

									break;


								case 2:
								case 5:
								case 8:

									// value * weight 1

									checksum = _calculate_checksum( passport_characters[i], checksum, 1 );

									break;

								default:

									throw "Invalid Passport Number Character[ " + i + " ] " + passport_characters[i];

									break;

							}

						}
						
					}

					return checksum % 10; // return remainder  which is the check digit

					/**
					 * @private
					 * 
					 * Return Array of values to use for Passport Characters
					 *
					 * @return {Array.encodingDb}
					 * 
					 **/
					function _generate_encoding_data() {

						var encodingDb 	= [];
						var alphabet 	= "abcdefghijklmnopqrstuvwxyz".split("");

						encodingDb.push({
							'character'	: '<',
							'encoding'	: '0'
						});

						var encode_start_digit = 10; //till 35

						for ( var i = 0; i < alphabet.length; i++ ) {
							
							encodingDb.push({
								'character'	: alphabet[i],
								'encoding'	: encode_start_digit
							});
							
							encode_start_digit++;
						
						}

						return encodingDb;

					}

					/**
					 * @private
					 * 
					 * Return Checksum value for
					 *
					 * @note encodingDb must be initialised first
					 *
					 * @return {Integer.checksum}
					 * 
					 **/
					function _calculate_checksum( ppChar, checksum, muliplier ) {

						if( intRegex.test(ppChar) ) {

							checksum =  checksum + ( ppChar * muliplier );

						} else {

							for (var k = 0; k < encoding_data_length; k++) {

								if( encoding_data[k] && ( encoding_data[k].character == ppChar.toLowerCase() ) ) {

									checksum =  checksum + ( encoding_data[k].encoding * muliplier );

								}

							}
									
						}

						return checksum;

					}

				}