mon = new Date();
mm = mon.getMonth()+1;


//▼月別背景画像自動変換スクリプト▼
switch(mm){
	case 12:
	case 1:
	case 2:
	case 3:
 document.write('<style type="text/css">body{background:url(/img/tyatyahime_back8.gif);}</style>');
 break;

	case 4:
	case 5:
	case 6:
	case 7:
 document.write('<style type="text/css">body{background:url(/img/tyatyahime_back9.gif);}</style>');
 break;

	default:
 document.write('<style type="text/css">body{background:url(/img/tyatyahime_back10.gif);}</style>');
 break;
}