Set column as only one cell width in xl sheet

hi,

I am using jasper report 3.0.I designed my report using ireport 2.0.2.My problem is when i am set the column width it occupy more than one cell.For example when i am setting column width 20 it occupy only one cell.Suppose my column width is 80 it occupy more than one cell.

I want my column width is occupy only one cell.

Thanks,

Viji Hillary.