Depending how you want the thumb to appear I know 2 ways.
File > automate > web photo gallery
Fill out the settings, and hit "ok" this will make a gallery and you can then get all the thumbs from the file it creates and delete the rest.
The other way is the "rectangle marquee tool" (top left square on tool pallet)
Select it, and at the very top under "style" go to "fixed Size" and fill out the size you want (ie: 150-100)
Then resize the image to whatever size you want (ie: 800x600) and left click on the image where you want your thumb to look like and your "rec. marquee tool" will appear, move it to where you want it and crop or ctrl-D and resize the image larger/smaller to get the look you want.
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