Has anyone found an extension for the USB/charging cable that works? I bought this http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=220475117818 and it does extend the cable. However when I plug in the iPhone (3GS) I get an error message stating that this device is not supported for charging. When I disconnect the extension, the stock cord works fine...it just too short for where I'd like to use it. The stock cord provided with the phone is fairly short so I would guess this has been an issue for others as well. Thanks in advance for any suggestions.