function InvertCheckbox(id) {
    var cbObj = $('#' + id);
    if (cbObj.attr("checked")) {
        cbObj.attr("checked", false);
    } else {
        cbObj.attr("checked", true);
    }
}

function CheckOrUncheckAll(name) {

    var objs = $("//input:checkbox[@name='" + name + "']");
    
    if (objs.attr("checked")) {
        objs.attr("checked", false);
    } else {
        objs.attr("checked", true);
    }
}