Pantech c150

is there a way to change the functions of the buttons on the Pantech C150? for example when you push down the joystick it goes to media net but i keep pushing it on accident and getting charged for being online. is there anyway to turn that function off or to make it so it goes to something else like my text messages instead of media net? same question for moving the joystick to the right (it goes to AIM and i dont want to use that on my phone)