Optimize images using node.js and smushit

gulpfile.js

var gulp = require('gulp');
var smushit = require('gulp-smushit');
// Original images are located at images_orig and the destination folder is images
gulp.task('default', function () {
	return gulp.src('images_orig/**/*.{jpg,png}')
		.pipe(smushit())
		.pipe(gulp.dest('images'));
});

ProcessImages.bat

@REM Note that it doesn't like spaces in the names 
npm install --global gulp-cli
npm install gulp-smushit
gulp