Can you implement redrawing only one bar in a bar chart when the value for that bar is changed?

I am trying to use a slider to change a value in a bar chart. However, when the value is changed, the whole chart gets redrawn, not only the part that changed. Here is what I am trying to replicate - http://www.budget.msu.edu/budget.swf. I know this is Flash so it might be too slow in JS, but I think it is worth the effort.

Thank you.