function click(e) {
    if (document.all) {
    if (event.button==1||event.button==2||event.button==3) {
    oncontextmenu='return false';
    }
    }
    if (document.layers) {
    if (e.which == 3) {
    oncontextmenu='return false';
    }
    }
    }
    if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
    }
    document.onmousedown=click;
    document.oncontextmenu = new Function("return false;")

    var travel=true
    var hotkey=17    /* hotkey即为热键的键值,是ASII码,这里99代表c键 */
    if (document.layers)
    document.captureEvents(Event.KEYDOWN)
    function check(e)
    { if (document.layers) {
    if (e.which==hotkey&&travel){
    alert("error!");   } }
    else if (document.all){
    if (event.keyCode==hotkey&&travel){ alert("errror!"); }}
    }
    document.onkeydown=check;