Format MS to Time Stamp "MM:SS:XX" in Javascript

gistfile1.js

function formatSeconds(seconds, format) {
    var ms = Math.floor((seconds*1000) % 1000);
    var s = Math.floor(seconds%60);
    var m = Math.floor((seconds*1000/(1000*60))%60);
    var strFormat = format || "MM:SS:XX";
    
    if(s < 10) s = "0" + s;
    if(m < 10) m = "0" + m;
    if(ms < 10) ms = "0" + ms;

    strFormat = strFormat.replace(/MM/, m);
    strFormat = strFormat.replace(/SS/, s);
    strFormat = strFormat.replace(/XX/, ms.toString().slice(0,2));
    
    return strFormat;
}