my iPhone 3G's apps wont update through iTunes, and the app store doesnt say there is an update available for that app. if it try to update through iTunes it gives me an error message. any help on how to fix this is highly appreciated. (also, if i go to the app store on my phone, an app that i already downloaded no longer sys installed where the install button is. its acts as i haven't installed the app and the button says free or the price, and if i click it it says install. if anyone has a fix for this too, it would also be appreciated greatly)