Hi, I have modeled a four bar mechanism for a project i am currently undertaking. (basically a washing up liquid bottle top hinge).

am having problems constraining everything so that it opens and closes perfectly. im quite new to maya and am getting quite confused. everytime i move something, another part flies off at a stupid angle. i want to be able to rotate one bar and the others move and rotate accordingly. i cant just rotate, so i tried using joints, but this doesnt seem to work



can anyone help??????please!!!