How to decrease column size of ajaxified jquery datatable? -

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i have 3 columns in datatable, had 4 , made 1 of them hidden using solution here

and first column expanded (only on firefox), column contains checkboxes.

now want decrease size of first column using function fnsetcolumnvis() ... please help.

screenshot : http://postimg.org/image/9s5wfge3j

in column definitions can specify column width this:

aocolumns': [             {                'mdata': 1,                'swidth': '20%'             },             ...

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