function ClearNamedCategoryCheckedStatus(F)                     // 'named' means the 'all' category is not included
{
    for (var i = 1; i < F.chkGrade.length; ++i)             // note that initial value of index must be 1, here
        F.chkGrade[i].checked = false;
    return;
}

function ClearAllCategoryCheckedStatus(F) {
    F.chkGrade[0].checked = false;
    return;
}

/*Location */
function ClearNamedGeographicCheckedStatus(F)                     // 'named' means the 'all' category is not included
{
    for (var i = 1; i < F.chkGrade.length; ++i)             // note that initial value of index must be 1, here
        F.chkArea[i].checked = false;
    return;
}

function ClearAllGeographicCheckedStatus(F) {
    F.chkArea[0].checked = false;
    return;
}


/*Search Function*/
function search() {
    document.frmEventSearch.submit();
}