Chak10

function randDarkColor() {
    var lum = -0.25;
    var hex = String('#' + Math.random().toString(16).slice(2, 8).toUpperCase()).replace(/[^0-9a-f]/gi, '');
    if (hex.length < 6) {
        hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
    }
    var rgb = "#",
        c, i;
    for (i = 0; i < 3; i++) {
        c = parseInt(hex.substr(i * 2, 2), 16);