String formatting for javascript

utils.js

// thanks to http://stackoverflow.com/questions/610406/javascript-printf-string-format/3492815#3492815

// very similar to string.format:
// "{0} is dead, but {1} is alive!".format("ASP", "ASP.NET")
String.prototype.format = function() {
    var formatted = this;
    var args = Array.prototype.slice.call(arguments);
    for(var i=0; args.length > i ;i++) {
        formatted = formatted.replace("{" + i + "}", args[i]);
    }
    return formatted;
};