JQuery :: Change Css Class Without Inline Style?

I have following css class.

.c2
{
width: 80px;
}

this class apply to each cell of my table as follow.

<div sortname="DiamondSKU" class="c2 DiamondSKU ds_grid_header_column sortable">
my div content
</div>

I am changing class value dynamically in my asp.net page using javascript,json, web service and jquery . assume didsku contain width of div that i have fetched from table and assigned to didsku javascript variable. var didsku = 93px;

then i am applying css using one of following way.

var a = { "width": didsku + "px" };
$("div.c2").each(function () {
$("div.c2").css(a);
});

[Code]....