RGB to HEX, HEX to RGB Can work with small hexes ('#000', '#f0c'), and RGB object ({r: 0, g: 0, b: 0})

hexandrgb.js

function hex2rgb(hex) {
    var int = parseInt(hex.replace(/^#/, '').replace(/^#/, '').replace(/^([\da-f])([\da-f])([\da-f])$/, '$1$1$2$2$3$3'), 16);
    return {
        r: (int >> 16) & 255,
        g: int >> 8 & 255,
        b: int & 255
    };

}

function rgb2hex(r, g, b) {
    if (isNaN(r)) g = r.g, b = r.b, r = r.r;
    return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}