How to add background color to a jQgrid row based on value of a column?

Question

This piece of code i am trying to add background color to jqgrid but no luck yet. Please someone help me to improve my code.Thanku in advance.

function (data) 
{
    var rowData = $("#grdTimeReport").getDataIDs();

    for (var i = 0; i < rowData.length; i++) 
    {
        if (data[i].rowData.ProdNonPro== "NP")
        {
            $("#grdTimeReport").jqGrid('setRowData', rowData[i], false, 'myclass');
        }
    }
}