Provide a generic format method for JavaScript strings. Use see fiddle http://jsfiddle.net/UkxE7/

gistfile1.txt

String.format = function(string) {
    args = arguments.length == 2 ? arguments[1] : arguments.slice(1);
    return string.replace(/{(\w+)}/g, function(match, idx) {
        return typeof args[idx] != "undefined" ? args[idx] : match;
    });
};

String.prototype.format = function() {
    return String.format(this, arguments);
}