gistfile1.txt

var done = function(err, image) {

				console.log('before undefined foo-function');
				foo();
				console.log('after undefined foo-function');

}

	function readImage(src, done) {

		var image = new Canvas.Image;
		image.onerror = function(err){
			done(err); // makes subsequent errors silently ignored, console.log('image.onerror:', err); instead reports error to console
		};
		image.onload = function() {
			done(null, image);
		};
		image.src = src;
	}