Just search forum, and read about creating USB connection using testpads (You can solder some cables to them, and end it with USB port). Of course, You may also check Your "regular" usb port parts, and try to repair it. It is also described with details on forum.

Either way, good luck.

/Estel

/Edit

If You connect *good class* charger to battery used by running device, nothing will happen - it will just charge. Ho ever, external charger can't distinguish between current used by phone operation, and current accepted by battery during charging, so it may not be able to terminate charging correctly. So, You should only charge battery to 80% or so. And never leave it unattended. As for simple non-RC LiIon chargers with one diode, I can"t predict how they will react.

More hassle than repairing device properly, if You ask me.