I can't scroll down the trackball of BB bold 9000... last time my hand was wet when i use it...and since that its can't move down... help please

BBs and wet do not get along very well.

How wet was your hand?

Remove the battery at once and place the device in a bag of uncooked rice for several days. That might save it. And read this:

Got Your BlackBerry Wet? - BlackBerryFAQ