Chrome extention to save images on HDD

Hello, We have a Mac app which allows our users to view images. It's very simple and works fine. We have an extension to Firefox which allows our users to save images from web in 1 click to HDD. We need to create same extension for chrome. All it has to do it to save an image to specific folder when user clicks an item of context menu for an image in chrome. It has to be done for MacOS X. It has to be done in 2-3 days. More details to relevant person.