Instances of symbol

Hi,
I am creating a walking cycle.I am having the following problem

I have created leg symbol(graphic).And made 2 instances forward leg , backward leg.Now both the legs are moving together.
What do I do so that I can animate them seperately???
like creating 2 different instances of the same symbol(which is graphic).
saw few tuts they talk about “instance panel” but Mx2004 doesn’t have this panel.