PhoneGap scrolling control property

(function() {
    function preventBehavior(e) {
        e.preventDefault(); 
        window.scrollTo(0, 0);
    };
    document.__defineGetter__("preventScroll", function() {
        return document._preventScroll;
    });
    document.__defineSetter__("preventScroll", function(preventScroll) {
        document._preventScroll = preventScroll;
        if (preventScroll) {
            document.addEventListener("touchmove", preventBehavior, false);
            document.addEventListener("scroll", preventBehavior, false);
            window.scrollTo(0, 0);
        } else {
            document.removeEventListener("touchmove", preventBehavior, false);
            document.removeEventListener("scroll", preventBehavior, false);
        }
    });
})();