Adjust and Expand custom CSV import extension

Already existing Custom Import Extension needs to be expanded. Right now it is able to upload certain collomns of a CSV file. Including uploading the right Image via an image url. Project: I have a few CSV files which do not have an Image URL like: http://imageshack.rjp.dhd.394993 but only have the imagenumber like: 394993 All the images that come with the CSV file need to be uploaded on the server and linked tot the corresponding product so the image will still be visible. So think of a way for me to still upload all the CSV files via the custom import extension and also allow the images to show together with the products via the server and the numbers. All images available in zip file. Price range. Max 50USD