Self-made iPhone 4 accesoiry doesnt work

I have made my own iPhone 4 accesoiry. It's a charger that works with 4 AA batteries.
This is how it's made:
4 AA batteries -----> 7805CT Voltage Regulator -----> Female USB Jack
I have measured the outbut of the usb jack and it was 5V 1A (just like the iphone needs).
I have measured the usb port of my iMac too and that was also 5V and 1A.
But when i connect my accesoiry to my iphone 4 it says : "Charging is not supported with this accesoiry"
Everything is connected the right way because i can charge my PSP with it.
Is this something in the iPhone 4 system? How can i solve it?

I reply here again because the boxes were becoming too small. I just wired everything up with crocodile wires (or how that's called) and some inprovising because i didn't had enough of them. It didn't work but it was a complex wiring :
It's almost midnight over here and tomorrow i have to take exam so i'm going to bed now. Tomorrow i wil get the resistors i need and some more crocodile wires. Thanks for helping me out today!

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