Div scrollbar issue with IE8

We have parent DIV and inside pa开发者_运维百科rent div we have following structure.

Div Main
   table1
   table2
   Child div
Div Main end

Now our child div have overflow:auto. So when scrollbar comes and we scroll it, it also scroll table1 and table2. This happen only with IE8. Works fine with previous version of IE. There is no overflow property on .

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If i provide height of child div in pixels, it works.