Can you tell me more details?
Well, what i did:
1. Creta blank 800x100 with white background (Layer: Background)
2. Open 1st image, then resize it with height 100 and then I use Rectangle Select to select that image, then copy the image and paste it into blank image (on 1st step) ~ Layer 1
3. Open 2nd image, then resize it with height 100 and then I use Rectangle Select to select that image, then copy the image and paste it into blank image (on 1st step) ~ Layer 2
4. Then i select Layer 1, then i click gradient tool and follow your suggestion..
but i don't understand further... can you please tell me how? something like step by step..
thanks,
yudi