making a bar graph animate up and down as you move a slider

hello everyone,

I am in need of some help.  i am creating a bar graph that has a slider for yr 14, 15, 16 the bar should slide up and down as you slide to the years but the bars should be able to ease the bar in a natural form rather than just jumping to the different size bars for the years.  i have seen this in a getting started demo with articulate but there is no demo of how to do it.  Can anyone help?