function geth(t){
	if (t<=5) document.write("<img src='img/main04.jpg' alt='Osaka' width='760' height='240' usemap='#Map'>");
	else { if (t<=15) document.write("<img src='img/main01.jpg' alt='' width='760' height='240' usemap='#Map'>");
	else { if (t<=18) document.write("<img src='img/main02.jpg' alt='' width='760' height='240' usemap='#Map'>");
	else { if (t<=23) document.write("<img src='img/main03.jpg' alt='' width='760' height='240' usemap='#Map'>");
	}}}
}