[Orangutan Amy]

Hi Sally,

You can do this using layer masks...
1. Place your pictures on separate layers across your banner overlapping each other
2. Select the layer you want to work on and click the 'add layer mask' icon at the bottom of layers palette
3. Select black as your colour and chose a very soft large paintbrush
4. In the layers palette on the selected layer you will see an extra little box has appeared, click on this to edit the layer mask and then just start 'painting' where you want the pic to blend in, this will create a soft edge

If this is gobbledygook give me a shout!!

Good luck
Amy :0)