Simple Mac Automator Droplet rename files

Hi, I'm need a simple droplet made with Automator that renames a folder of files. The budget for this project is $10 Description: I will drop a folder of images onto the droplet. The filenames of the images in the folder will always be the same. [login to view URL], [login to view URL], [login to view URL] etc. However, the amount of images will always be different, there may be up to 50 files in the folder. (The images are openings in a photobook design, the first and last image only show one side, but all other images show two sides of the design). The droplet will rename the images as follows: [login to view URL] -> [login to view URL] [login to view URL] -> [login to view URL] [login to view URL] -> [login to view URL] [login to view URL] -> [login to view URL] etc... the last image will be renamed with {(number of image x 2) - 2}, for example : [login to view URL] -> [login to view URL] or [login to view URL] -> [login to view URL] Technical requirements: This needs to be working as a droplet, I drop a folder with images on it, and the files will be renamed. The droplet needs to be working in Mac OS10.4 and the latest version of Mac OS