How to fix the columns width in the header?

How to fix the columns width in the header?

gege25gege25 Posts: 1Questions: 0Answers: 0
edited November 2012 in FixedHeader
Hi,
I try to fix the first column width of this page : http://bordeaux-tradition.com/outil/micro.php but i cant find how to resize it to 50px :)
I have included "bAutoWidth": false, and "sWidth": "50px" but it also doesn't work, like also Date or
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