Object.prototype.inheritFrom = function (fnClass) {

    function inheritClasses(fnClass, arrClasses) {
        
        arrClasses.push(fnClass);

        if (typeof fnClass.__superclasses__ == "object") {
            for (var i=0; i < fnClass.__superclasses__.length; i++){
                inheritClasses(fnClass.__superclasses__[i], arrClasses);
            }
        }
    }
    
    if (typeof this.constructor.__superclasses__ == "undefined") {
        this.constructor.__superclasses__ = new Array();
    }
    
    inheritClasses(fnClass, this.constructor.__superclasses__);
    
    for (prop in fnClass.prototype) {
        if (typeof fnClass.prototype[prop] == "function") {
            this[prop] = fnClass.prototype[prop];
        }
    }
};

Object.prototype.instanceOf = function (func) {

    if (this.constructor == func) {
        return true;
    } else if (typeof this.constructor.__superclasses__ == "object") {
        for (var i=0; i < this.constructor.__superclasses__.length; i++) {
            if (this.constructor.__superclasses__[i] == func) {
                return true;
            }
        }
        return false;
    } else {
        return false;
    }
};