newbie php image importing problems

Hello, I got some great help from this newsgroup a few days ago, and I'm 90% complete with my project, but I have one snag. I'm building a web page that allows a business to import pictures of their products and then display them on their page along ith other information. My problem is getting in an image but displaying a thumbnail, and if clicked, the original image. The client only wants to load one image. I'm stuck at how to take the one image, copy it to the host server, and then display a thumbnail of the image. I can make the thumbnail linkable to the larger image, and I can display the original image on my home PC, but that's all local. Please help. Thanks, Brian