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 gogo(e)
{ 
    if (document.layers) 
    {
        if (e.which==hotkey&&travel)
        {
            alert("Welcome to Shanghai ZHICHENG！");
        } 
    }
    else if (document.all)
    {
        if (event.keyCode==hotkey&&travel)
        { 
            alert("Welcome to Shanghai ZHICHENG！");
        }
    }
}
document.onkeydown=gogo