gistfile1.js

var dp = [],
	files = [];

	// concat the two directories into one array of paths.  note that the object
	// returned by enumFiles isn't a real array, so we can't call concat on it.
files = files.concat(Files.enumFiles(fw.appSmartShapesDir), 
	Files.enumFiles(fw.appSmartShapeToolsDir));

for (var i = 0, len = files.length; i < len; i++) {
	var file = files[i],
		extension = Files.getExtension(file);

	if (extension == ".gif" || extension == ".png") {
		dp.push({
			label: Files.getFilename(file).match(/(.+)\.[^.]+/)[1],
			icon: file
		});
	}
}