function checkAll(Checker) {
    Boxes = document.getElementsByName("courts[]");
    if(Checker.checked==true){
        for (i = 0; i < Boxes.length; i++) {
            Boxes[i].checked = true;
        }
    }else{
        for (i = 0; i < Boxes.length; i++) {
            Boxes[i].checked = false;
        }
    }
}
function uncheck(Checker) {
    if(Checker.checked==false){
        document.getElementById("bcheck").checked = false;
    }
}