function qx() {
var qx = document.getElementById("qx");
if(qx.checked){
$("input:checkbox").prop("checked","true")
}else{
$("input:checkbox").removeAttr("checked")
}
}
function qx() {
var qx = document.getEfunction qx() {
var qx = document.getElementById("qx");
if(qx.checked){
$("input:checkbox").prop("checked","true")
}else{
$("input:checkbox").removeAttr("checked")
}
}
function qx() {
var qx = document.getE