keyControl

$(document).keydown(function (event) {
    if(event.ctrlKey) {
        code  = (event.keyCode) ? event.keyCode : event.which;
        _stok = ["S", "U"];

        for(key in _stok) {
            if(code == _stok[key].charCodeAt(0))
                event.preventDefault();
        }

        if(event.shiftKey) {
            if(code == "J".charCodeAt(0))
                event.preventDefault();
        }
    }
});