RowCallBack does not change text color on row?

Hi,

I have a simple function that is intended to change the foreground color of a row depending on the value of a column. Here's my code:

$(document).ready(function() {
    $('#tblResults').dataTable({
        "fnRowCallback": function( nRow, aData, iDisplayIndex, iDisplayIndexFull ) {
            switch(aData[3]) {
                case "WWIP":
                    $(nRow).css("color", "yellow");
                    break;

                case "WCSW-I":
                    $(nRow).attr("style", "color:red important");
                    break;

                case "WBW":
                    $(nRow).css("color", "black");
                    break;
            }
            return nRow;
        }
    });
});

The text color is not changing although I have confirmed that the switch is executing (using alerts) and that the code is being executed. I even confirmed that the css color style is changed by going into the HTML portion of firebug. The text is still displaying as black, though.

Any ideas?