I have the bones for each eye and a null for the target but I can't seem to get the eyes to follow it I triede a aim roll like but no go ,any idea wich one I need.I placed the eye bones under the head bone in the hierachy but didn't atach them is the correct ,thank's for any help steve

"Aim at" constrain the eye bones to your target. And make sure you turn ON the pose in which you made those constraints.

Thank's Rob that done the trick ,working a treat now