A/C adapter and Computer connection at same time

[SleepyNyte]

On my Palm Treo 700wx, the docking station allowed for two connections, one to a PC for data connection, and another connection for an A/C adapter to charge the phone. I liked this set up because it would charge my phone even if my computer was shut down. I was wondering if a mini usb cable to dual usb cable set up could replicate this with an HTC Diamond. Anyone tried this?

Example of the cable I am talking about:

http://ecx.images-amazon.com/images/...500_AA250_.jpg