struck at mapping product images, stored as vendorpart name in folder.

I have downloaded the 1.5 version nopcommerce , I am struck at mapping product images.
All product  images are stored as vendorpart name in folder. I have huge products list, I managed to import to the DB. I have disabled the images to  STORE IN DB function. All the product images are in a folder as the vendorpart name. I cannot add the piciture to the product manually due to huge product list, Is there any logic to map the vendorpart name to pictureid in picture table? Or any other way to do this.
Any help is appreciated.