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Sum of any column for slected rows

Hi,

I want to calculate sum of all the selected rows for particular column.How to do it?
Thanks.

-Agile

var summ=0;
var ids = mygrid.getSelectedRowId().split("");
for (var i=0; i<ids.length; i++) 
   summ+=mygrid.cellById(ids[i],INDEX).getValue();

where INDEX - zero based index of necessary column