watermarking photos

Hi guys. I have a watermark I have designed in Photoshop as a jpeg but want to be able to batch it to all my photos so i don't have to individually add them to each photo. How can I do this? I tried making an action but it doesn't seem to work well... Or I have no idea what I'm doing lol. Help please?

Okay,
here is what I did yesterday (this is a simplified version of the video tutorial i am posting below)...and these steps seem to work for me better and faster than the video

1. open photoshop
2. have the actions panel open on the right side. Create a new set, call it anything.
3. Open your logo file, highlight the section of the logo you want to copy..and copy it to the clipboard using CTRL + C. close the file
4. open your first sample photo.
5. In actions, create new action (the postit icon on the right bottom corner of the actions panel). label it "logo branding" click record.
6. go to file - automate - fit image, set it to 1000 x 1000
7. go to image, image size, set the dpi to 100 and leave (unchecked) out resample
8. create a new layer by clicking on the post it note in the layer panel
9. paste your logo, it will appear dead center.
10. click edit, Free Transform (ctrl + t)
11. move the logo to the where you want (the video gets specific if you want absolute positioning)
12. flatten the image by clicking on the Actions button in the layers panel....and choosing Flatten image.

Also, here is the visual tutorial;
http://av.adobe.com/russellbrown/BrandingSM.mov

Even though the narration is excruciatingly annoying at parts..
hope that helps!