Make disabled all check boxes in JQGrid

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jQuery

JQGrid

Hi all,

I am working on JQGrid...in there i am using multiselect:true...

Nad getting first column as Chekbox....if i select on checkbox and set it as a winner then nex time when see that record all the checkboxes should be disabled and those whose were selected last time that check boxes should be checked..........
i found how to hide that row but i am not able to find how to disabled all the check boxes in JQGrid....

the code for my JQGrid is ..............

$("#Participant").jqGrid({
                url: 'Handlers/AllContestParticipantHandler.ashx',
                editurl: 'Handlers/AllContestParticipantHandler.ashx',
                datatype: "xml",
                mytype: "GET",
                width: 736,
                height: "100%",
                colNames: ['Contest Title','Member Name','Email Id','Flag','Winner','Contribute'],
                colModel: [
                                { name: 'ContestTitle', index: 'ContestTitle', editable: true,edittyp: 'text', editrules: { required: true} },
                                { name: 'MemberName', index: 'MemberName', editable: true, sorttype: 'text'},
                                { name: 'EmailId', index: 'EmailId', editable: true, sorttype: 'text'},
                                { name: 'Flag', index: 'Flag', editable: true, sorttype: 'text'},
                                { name: 'Winner', index: 'Winner', editable: false, edittype: "checkbox", editoptions: { value: '1:0' }, formatter: "checkbox", formatoptions: { disabled: true }, sortable: false},
                                { name: 'Contribute', index: 'Contribute', editable: false, edittype: "checkbox", editoptions: { value: '1:0' }, formatter: "checkbox", formatoptions: { disabled: true }, sortable: false},
                ],
                onCellSelect: function(rowId, iCol, cellContent, target) {
                    parentRowId = rowId;
                },
                pager: "#pager",
                caption: "All Contest Participants",
                sortName: 'ContributedRecipeId',
                rowNum: 10,
                sortorder:'desc',
                multiselect: true,
                rowList: [10, 20, 30],
                viewrecords: true
            }).navGrid("#pager", { edit: false, add: false, del: true, search: true },
               {reloadAfterSubmit: true, jqModel: true, closeOnEscape: true, closeAfterAdd: true},//del
               {closeAfterSearch: true, drag: true, closeOnEscape: true, afterShowSearch: function() {
                $.post("Handlers/AllContestParticipantHandler.ashx?valSearch=true", {}, function(data) { });
               }}
            )

Please go through this tell me if i can make disabled all the check boxes...

Thanx in advance...