thanks for your replies,
first off i don't think it's the hub bearings that is the problem, what is happening is that the rear rim can be moved to one side and it will stay that way and if i spin the wheel it will just hit the rear brake as if it was out of true. but if i put weight on the saddle i will hear the rim center with a little bit of creak from the spoke hub joint.
then when i lift the back end off the ground and spin the wheel it is true.
i quess by your comments the spokes are loose, wound it be wise to buy the tools and and tension the spokes myself. i do not have a truing stand (i'm a pure noob regarding wheels), but did put bike together piece by piece so i'm not totalling incompetent. hopefully i can go by the numbers given on the park tools sight...