Hi Swarnam,
I already did that. Also used trial version of FusionCharts. The problem is still there. The problem is in library, I am facing this issue from the earliest versions. But opposite to Flash version, Javascript doesn't have a solution. I used Flash versions and dispose worked ok, the memory became free and I could run re-rendering of charts for days, weeks and months without page reload. Now I have to move to HTML and the memory becomes fully used at the end of first day. Have you run charts re-rendering in long term (without page reload)? For example, use setTimeout or setInterval.