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Arithmetic Calculations problem

Hi,
When i try to perform Arithmetic calculations like the following it id displaying a JAVASCRIPT ERROR.
Also I am unable to proceed further.

<cell type="math" width="150">=(c7+c8)/100 </cell>

I observed that when i remove
mygrid.enableCollSpan(true); statement, the math calculations work perfectly,

Pls help me on this as i have to use both colspan and math calculations

Please check sample, which was send by email. It contains the grid with enabled colspans and still works correctly.
The usage of colspans and the math in the same time can really have some limitation, but it must not cause any js errors in any case.