[photoshop-beginners] shrink image to put on web

Hi,
I received an image I'd like to post on a Joomla web site. It's about 800k. I'm able to reduce the resolution for a smaller file size in "Image Resize...". However, after uploading the image to the site, it shows up very large left-to-right & top-to-bottom. How would I go about shrinking it to a more appropriate size, without cropping away much of the picture? Is there a way to do this?
(using Photoshop Elements 7). Thank you.

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