jQuery Grid Plugin - jqGrid

Hi All,

I am stuck in my prograaming for the jqgrid. i am calling the dynamic rows accoring to the records in the DB and it is having the radio button. On click of radio button i want to have action. which i m trying but not happening.Would you please guide me for that.

 colNames : ['Select','SID'],
            colModel : [
                {
                    name:'select',
                    label:'Select',
                    width: 60,
                    align:'center',
                    edittype:'custom',
                    editable:true,
                    formatter: function (cellValue, option) {
                        return '<input type="radio" name="radio_' + option.gid + '" />';
                    }
                },
                {
                    name : 'id',
                    index : 'EMP_ID',
                    width : 100,
                    fixed: true,
                    sortable : false
                }};

I want to having on the formater funtion. Its a ajax call for submit. Please suggest me how i can proceed for that.Since from the above  code i m unable to get the id for this also and how to perform the ID.