document.onkeydown=key;
document.oncontextmenu=cancelMenu;

function key(){
    if(window.event.keyCode==112)
    {
        if(helpid!="")main.showhelp(helpid);
        event.returnValue=false;
    }

    if(window.event.keyCode==113)
    {
        main.showclipboard(1);
        event.returnValue=false;
    }

    if(window.event.keyCode==116||window.event.keyCode==117)
    {
        event.returnValue=false;
    }
}

function cancelMenu()
{
    window.event.returnValue=false;
}