jQuery Grid Plugin - jqGrid

I want to have sum of a column in footerData. I am loading data from "mydata" Here is the code I am using

var colNames=["id","Name","Owner","Amount"];
var colModel=[
        {name: 'id',index: 'id',hidden: true},
        {name: 'Name',index: 'Name'},
        {name: 'Owner',index: 'Owner'},
        {name: 'Amount',index: 'Amount',align: 'right',sorttype: 'float',formatter: 'currency',summaryType: 'sum',
        formatoptions: {decimalSeparator: ",",thousandsSeparator: ",",decimalPlaces: 2,prefix: "$ "}}
    ];
var mydata=[
        {id="374", Name="QA", Owner="James Robert", Amount="100.00"},
        {id="374", Name="QA", Owner="Mayank Khandelwal", Amount="200.00"}
      ]

      jQuery("#list2″).jqGrid({
            data: mydata,
            datatype: "local",
            height:'auto',
            rowNum: 10,
            rowList: [10,20,30],
            colNames:colNames,
            colModel:colModel,
            pager: "#pager2″,
            viewrecords: true,
            sortname: 'name',
            grouping:false,
            groupingView : {
                groupField : ['Owner'],
                groupSummary : [true],
                groupColumnShow : [true]
            },
           footerrow: true
        });

I want to show a footer of Amount some thing like this "<b>Total: </b> $200.00″