Gets the contrast color for a given color

getContrastColor

var getContrastColor = function(hexcolor) {
    var hex = hexcolor.replace(/[^0-9a-f]/gi, '');

    var r = parseInt(hex.substr(0, 2), 16);
    var g = parseInt(hex.substr(2, 2), 16);
    var b = parseInt(hex.substr(4, 2), 16);
    var yiq = ((r * 299) + (g * 587) + (b * 114)) / 1000;

    return (yiq >= 128) ? 'black' : 'white';
};