function login()
{
login_window = window.open("login_book.php"+self.location.search,"login","scrollbars=no,resizable=no,width=403,height=182,left="+(screen.width-400)/2+",top="+(screen.height-170)/2);
login_window.focus();
}

function tour()
{
login_window = window.open("tour.php"+self.location.search,"tour","scrollbars=no,resizable=no,width=760,height=420,left="+(screen.width-760)/2+",top="+(screen.height-420)/2);
login_window.focus();
}

function tour_from_login()
{
login_window = self.open("tour.php"+self.location.search,"tour","scrollbars=no,resizable=no,width=760,height=420,left="+(screen.width-760)/2+",top="+(screen.height-420)/2);
login_window.focus();
self.close();
}

function tourspecial(nr)
{
tour_window = window.open("tour.php?nr="+nr+"&"+SID,"tour","scrollbars=no,resizable=no,width=760,height=420,left="+(screen.width-760)/2+",top="+(screen.height-420)/2);
tour_window.focus();
}