From the site:
http://www.graphic-design.com/Photos...ermarking.html
Semi-Automated Watermarks
Set up your watermark the way you want it, including type or even logos, and then
Choose: Edit > Define Custom Brush
This will convert your watermark into a custom brush to be used in any file. You'll have the ability to set color and transparency appropriate to the specific file.
Warning: if you like this method, always be aware of resolution. Be sure to set up your brush image so it looks correct in the file resolution you'll be using. Many pros have multiple custom brushes such as this set up for the various resolutions they frequently deal with.
Be sure to give your brush an appropriate name -- particularly if you have multiple brushes for different resolutions. You can name the brush in the Define Custom Brush dialog.
With a custom brush watermark, just open a group of files, click with the brush, and save. Change color or transparency on the fly. You can mark a number of files quickly -- yet retain some degree of control as you progress through the files.
That's all there is to it!
If you'd like to know how to do something in Photoshop or Photoshop Elements, just ask. And, don't forget to visit the Adobe Photoshop Elements User Group web site and Photoshop Elements discussion forums.