var tween = { linear:function(t,b,c,d){ return c*t/d + b; }, easeIn:function(t,b,c,d){ return c * ( t /= d ) * t + b; }, strongEaseIn:function(t,b,c,d){ return c * ( t /= d ) * t * t * t * t + b; }, strongEaseOut:function(t,b,c,d){ return c * ( ( t =