I used your instructions to build a mouseover photo album and it works brilliantly. Thank you for your specific instructions. In those instructions you mentioned that if I have some vertical photos and horizontal photos to make them the same. This is the part I don't know how to do. How do I change my vertical pictures into horizontal ones with transparent backgrounds. Could you please give me a few more instructions so I know how to begin? I would greatly appreciate any assistance. Thanks.

Go here: http://www.pixelmator.com/try/ to download the trial version of Pixelmator (unless you already have a the full version)

1. Open Pixelmator and hit "Create new image…"
2. Enter the size you want and hit "OK"
3. You will get a new image with white background
4. Hit Command (cmd) + a to select the background then hit the delete key to get rid of the white. Now the background is transparent.
5. Drag&Drop your vertical image into the new image. You can then move it around to center it. View=>Show Grid may help. I wonder if there is an easier way to center the image. Never used Pixelmator before sorry. If you find out let me know.
6. Click on the cogged gear on the top left of the new image window and choose transform or go to Edit=>Transform to be able to resize the vertical image you added
(when resizing choose one of the angles and click and hold shift while resizing)
then hit OK
7. Go to File, Export, choose PNG and you will have your vertical image with the same size of a horizontal image with transparent background.

Regards,
Cédric

Thank you for the details. I'm sure it will work great I will give it a try now and let you know. I use sumo paint to edit photos so I will try it with that first and if not successful try the site you recommended and get back to you as soon a I do. Thanks again!!!

Thank you again. Pixelmator was terrific. You are awesome. I really appreciate all your help.

Even by using grids and guidelines I find it pretty hard to center an image in Pixelmator. I really can't understand why there isn't a one click option or any useful tool to center the image in an otherwise good application. But it may be helpful to center one image then just put the next image on top of it to make sure they are all equal.

Thanks for saying thank you