auto inserting thumbnails into an office program for web use

Hi, I have a web site which has a folder with Jpegs in, already thumbnailed,
what I would like to be able to do is have a program which looks at the pre
defined folder and inserts all the thumbnails to it, next to the indiviual
thumbs I would lke to be able to select a size (6x4,7x5,8x10,10x12)and number
required to order for printing then email me with the results. I know this
sounds like a shopping cart but I only sell photographs for clients so need
someting easy to set up for each folder (client)