WII internet help?please?

k so i have a wii that knows my internet connetion which is a WPA-PSK(TKIP) just to let you know and my mom threw away the pword so now i'm messed up. how do i get the pword back? any spefic ways? cuz now i can't register any one but i could now i cant. so. . . what do i do? i know the pword except the wii says its wrong and the pword is over 30 letters and numberes. HELP! kthxby