Use this function to set the maximum number of steps for the major/minor ticks that are used if automatic generation of ticks is turned on. If you set your own values for the ticks on the axis this settings will not have an effect. Note that by default the ticks are generated automatically.
value for steps of ticksMajor (NULL => default of 5 used)
value for steps of ticksMinor (NULL => default of 25 used; at least the minor value)
see Image_Graph_Axis::setTicksMinor()
see Image_Graph_Axis::setTicksMajor()
see $_ticksAutoSteps