function to resize images

Does anyone have a nice function that will resize an uploaded image to specific width/height dimensions? I wanted to find something that would work for only GIF and JPG image types. I've converted my shopping cart application from Cold Fusion to PHP and need to create thumbnails and reduce the size of large uploaded images. I've already done a google search and found an example but can't get it to work for some reason and it includes a bunch of other stuff that's not needed and too much trouble to remove. Thanks, Dave HTC Disclaimer: The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Thank you.