put chart in fix place on webform

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Hi, All,

I creat chart and the chart shows between top menu and bottom menu on the
webform on the pageload (first time), but when user select chart item on the
top menu and generate chart again, the chart shows on the different page
without top and buttom menu, I want chart dispaly on the same place as first
time the chart shown position, can anyone help thisout or any suggestion?

Thanks,
Martin