Alloy Images

I have 40 images of alloy wheels. This is what is required: 1. Each one needs the background removed so I am left with just a cut out of the alloy. I would like this done in photoshop so I am able to use the psd file later. I have attached [login to view URL] which is an example of one of the images. It has been reduced in size for this example but most of images are much bigger (1Mb). 2. The image then needs to be saved as transparent gifs in different sizes like the attached files [login to view URL], [login to view URL], [login to view URL], [login to view URL], [login to view URL], 702_19.gif. Each size represents the diameter of an alloy wheel. 14",15",16",17",18" and 19". The intention is to use the attached file [login to view URL] as a background image in an html table. The transparent gifs can then be placed over the top of the blacked out wheel section. The transarent gifs must allow for the black background to make them blend in.