jQuery Grid Plugin - jqGrid

HI,

I have jqgrid used with json data which is refreshed/navigated by jqgrid itself as follows.

    //construct grid
    $("#tblMyGrid").jqGrid({
        url:'studentlist.php',
        datatype: "json",
        jsonReader : {
              root: "rows",
              page: "page",
              total: "total",
              records: "records",
              repeatitems: false,
              id: "0"                  
            },
        height: 197, ..........

Now lets say I loaded the grid and keep it for long time and access the grid again (lets say I refresth the gird). But since I kept the application idle for long time it has got logged out. So my jqgrid getting hanged with "loading ..." text. I need to capture this kind of

situations and need to direct to the login page back the user. Do we have any mechanism in jqgrid to capture this kind of situations ?

Thanks and Best Regards

Lasantha