I made a large table for jquery.datatables which is works great for me.

but i need a class name set to each td element relative to its column.

fo example i want a column (including th and all td's) have a class=volume.

there is this issues:

i use this code to initialize the class but it is not working.

aoColumnsDefs: [

    { sClass: volume, aTargets: [2] }

]

EDIT:
my table is created and refeshes dynamically. and it is made of a js-array which i prefer not to touch it ie. just to add class names

EDIT:

iuse this code to itialize my table:

$('#dataTable').dataTable({

    aaData: dataCnt,

    aoColumnsDefs: [

        { sClass: volume, aTargets: [2] }

    ],

    aoColumns: columnsHd,

    bStateSave: true,//saving status in coockie

    iCookieDuration: 10,//coockie life duration in seconds

    sScrollX: 100%,

    sScrollY: (winHei-200),

    sDom: '<HRCfrl>t<pFi>',

    oColVis: {

        buttonText: &nbsp;,

        bRestore: true,

        sAlign: left

    },

    aLengthMenu: [[10, 25, 50, -1], [10, 25, 50, All]]

});

i hope it helps
*EIDT: *

columnsHd is an array which is created dynamicaly from my json headers and now is exactly:

[

{ sTitle: macaddr },

{ sTitle: lat },

{ sTitle: ip },

{ sTitle: clientname },

{ sTitle: relay0mask },

{ sTitle: relay0stat },

{ sTitle: relay1stat },

{ sTitle: clientid },

{ sTitle: bldname },

{ sTitle: uptime },

{ sTitle: current },

{ sTitle: temperature },

{ sTitle: softver },

{ sTitle: volume },

{ sTitle: hardver },

{ sTitle: relay1mask },

{ sTitle: pic },

{ sTitle: comment },

{ sTitle: lon },

{ sTitle: rtt },

{ sTitle: bldaddr },

 ]