//numは切り替える画像の数
num = 4;
img_name = new Array();
for (i=0; i<num; i++){
	number = i+1;
	img_name[i]= "/bridal/blog/image/title_banner" + number + ".jpg";
}

function disp_image(){
	ran = Math.floor(Math.random()*100);
	Dt = new Date();
	Sec = Dt.getSeconds();
	chg = Sec * ran % num;
	document.write("<img src='" , img_name[chg] ,"' width='770' height='150' alt='ANA INTERCONTINENTAL HOTEL TOKYO BRIDAL BLOG' />");
}