DOS Batch - [Batch file] Help copying and renaming sequence

I have a network camera that displays its current frame at xxx.xxx.xxx.xxx/image.jpg and I would like to have a batch file on my xp machine I can click that copies that jpg across the network and appends it to an image sequence on disk. So the script would check the largest existing numbered file in the directory and append the next increment to the filename (ie. image0001.jpg, image0002.jpg, image0003.jpg)

Any help would be greatly appreciated.