Feature detect base64 support for images in mootools

Browser.features.base64.js

// http://www.jsfiddle.net/5JT45/10/show/

(function() {
    Browser.Features.base64 = null;
    var callback = function() {
        Browser.Features.base64 = this.width == 1 && this.height == 1;        
        // alert(Browser.Features.base64); // true || false
    };
    
    var img = new Image(), element = document.id(img) || new Element("img");
    element.onload = element.onerror = element.onabort = callback;
    // 1x1 px gif to test with
    img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
    
})();

is it humanly possible to make more mistakes on a less-than-10 lines snippet? hopefully it's now done and dusted.