matthewbeta

	
	/* Hide only visually, but have it available for screenreaders: h5bp.com/v */
	.visuallyhidden { 
		border: 0; 
		clip: rect(0 0 0 0); 
		height: 1px; 
		margin: -1px; 
		overflow: hidden; 
		padding: 0; 
		position: absolute; 

ShirtlessKirk

/**
 * Luhn algorithm in JavaScript: validate credit card number supplied as string of numbers
 * @author ShirtlessKirk. Copyright (c) 2012.
 * @license WTFPL (http://www.wtfpl.net/txt/copying)
 */
var luhnChk = (function (arr) {
    return function (ccNum) {
        var 
            len = ccNum.length,
            bit = 1,