function checkboxSelectAll(checkboxName) {
    var checkboxs = document.getElementsByName(checkboxName);
    for (var i = 0; i < checkboxs.length; i++) {
        checkboxs[i].checked=true;
    }
}

function checkboxDeselectAll(checkboxName) {
    var checkboxs = document.getElementsByName(checkboxName);
    for (var i = 0; i < checkboxs.length; i++) {
        checkboxs[i].checked=false;
    }
}

function checkboxCheckSelected(checkboxName) {
    var checkboxs = document.getElementsByName(checkboxName);
    var isChecked = false;
    for (var i = 0; i < checkboxs.length; i++) {
        if (checkboxs[i].checked==true) {
            isChecked = true;
        }
    }
    if (isChecked) {
        document.getElementById("form").submit();
    } else {
        alert("No selections made. \nPlease make a selection.");
    }
}