$(document).keydown(function(e) {
    return 123 == e.keyCode ? !1 : e.ctrlKey && e.shiftKey && 73 == e.keyCode ? !1 : void 0
}), document.addEventListener("contextmenu", function(e) {
    e.preventDefault()
}), document.onkeydown = function(e) {
    return !e.ctrlKey || 67 !== e.keyCode && 86 !== e.keyCode && 85 !== e.keyCode && 117 !== e.keyCode ? !0 : !1
}, $(document).keypress("u", function(e) {
    return e.ctrlKey ? !1 : !0
});