Problem with image colors After to Stage

HI

I draw a fancy button in photoshop. The problem is that when I import it the colors are not the same. I double check the file, and the file I imort to Stage as the normal color. After import the color dies and the gradient doesn’t exist. I tried with PNG, JPG and GIF. All the same problem.

I am on a Mac using CS3.

Any tip o solve this?