Planning my simple solar powered USB charger Answered

1. Would this circuit work to charge batteries and a USB? and then the batteries charge the USB at night? http://img12.imageshack.us/img12/5403/circuitr.jpg. (the solar panel is changed: it's 6v 200mA)

2. I need a diode to prevent battery discharging, and maybe a voltage regulator for USB. Does anyone know where i can get this and where i can put it?

3.Is this solar panel a good fit for the circuit and my needs? The battery and USB are in parallel so voltage would be fine?

4. To connect the USB, just connect positive to red, and negative to black, right? Also i hear you need to bridge the other two connections as well to make them work with my iTouch, how do I do this?