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Generates random RGB values between two color intervals.
Created: 2005.11.20

//+ Carlos R. L. Rodrigues
//@ http://jsfromhell.com/geral/rgbrandom [rev. #1]

function RGBRandom(c, e){
    var rgb = "#", r, c = parseInt(c, 16), e = parseInt(e, 16), n, h = "0123456789ABCDEF";
    for(var i = 3; r = Math.round(((c >> (--i << 3) & 0xff) - (n = (e >> (i << 3) & 0xff))) * Math.random() + n), i + 1;)
        for(var j = 2; j--;) rgb += h.charAt(r >> j * 4 & 0xf);
    return rgb;
};

<style type="text/css">
    .default{
        border: 1px solid #000;
        margin: 3px;
        width: 250px;
        height: 80px;
        float: left;
        font: 10px verdana;
        text-align: center;
        color: #fff;
    }
</style>

<div style="width: 780px; margin: auto;">
<script type="text/javascript">
//<![CDATA[
    for(var i = 2 * 3, c; i--;) // #990000 - #ff0000 // RED
        document.write("<div class='default' style='background:" + (c = RGBRandom("990000", "ff0000")) + ";'>" + c + "</div>");
    for(var i = 2 * 3, c; i--;) // #009900 - #00ff00 // GREEN
        document.write("<div class='default' style='background:" + (c = RGBRandom("009900", "00ff00")) + ";'>" + c + "</div>");
    for(var i = 2 * 3, c; i--;) // #000099 - #0000ff // BLUE
        document.write("<div class='default' style='background:" + (c = RGBRandom("000099", "0000ff")) + ";'>" + c + "</div>");
    for(var i = 2 * 3, c; i--;) // #cccccc - #ffffff
        document.write("<div class='default' style='color:#000;background:" + (c = RGBRandom("cccccc", "ffffff")) + ";'>" + c + "</div>");
//]]>
</script>
</div>

RGBRandom([start: String = "000000", end: String = "FFFFFF"]): String

Returns a RGB value within the limits. The color intervals are distinct for the R(red), G(green) and B(blue).

start

initial RGB

end

final RGB

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