jqGrid editing fields: CheckBox is not checked/unchecked according to field's value

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In edit form, i need checkbox already checked if Active field value is 'true'. Currently it shows always unchecked for both values (true/false in Active)

{ name: 'Active', index: 'Active', width: 150, align: 'center', editable: true, edittype: 'checkbox',
                    editoptions: { value: "true:false", defaultValue: "false" },
                    formatter: function (cellvalue, options, rowObject) {
                        if (cellvalue == 'true' || cellvalue == true)
                        { return "<img src='Images/active.png' style='width: 20px; height: 20px;' alt='Active'title='Active' />"; }
                        else
                        { return "<img src='Images/inactive.png' style='width: 20px; height: 20px;' alt='In Active'title='In Active' />"; }
                    }
                }

Thanks in advance.
Please help...Am I missing something...

Note: in grid i need images according too Active value (this working fine). But on edit the record Active field having checkbox having its value according to Active field (this not working).