function osaka(){ window.open("osaka.html","Osaka", 
"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width=550,height=500") }

function tokyo(){ window.open("tokyo.html","tokyo", 
"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width=550,height=500") }