Sorry ....do not know why this site changes my budget!
Need a transparent GIF mask where the center is a perfect circle and the inside is transparent, the outside is plain white. The dimensions are 170 Px X 170 px. I've attached a screen shot.
I intend to use this as mask over 107 X170 images to create a circle effect.
* if you do this in Photoshop, I'd appreciate having the .psd in case the size changes!