if (document.layers){
    window.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP)
    window.onmousedown=rightclick;
    window.onmouseup=rightclick;
    function rightclick(e) {
    if (e.which == 3) {    
        alert('Copyright 2007 Adolf Würth Airport Schwaebisch Hall');
    return false;
    }
    else {
        return true;
        }
    }
}
if (document.all)
{
    function click() 
    {
        if (event.button==2) 
        {
            alert('Copyright 2007 Adolf Wuerth Airport Schwaebisch Hall');
        }
        if (event.button==3) 
        {
            alert('Copyright 2007 Adolf Wuerth Airport Schwaebisch Hall');
        }
    }
    document.onmousedown=click
}