function random_banner() {
	banner = new Array();
	banner[0]="img/banner_sample.jpg";
	banner[1]="img/top_banner_111226.jpg";
	banner[2]="img/top_banner_homon.jpg";
	message = new Array();
	message[0]="サンプル帳往復完全無料レンタル中！";
	message[1]="2012年春の特価セール";
	message[2]="出張採寸・見積り無料";
	link = new Array();
	link[0] = "sample/";
	link[1] = "info/?cat=16";
	link[2] = "flow/explanation.html#03";
	rand = Math.floor(Math.random()*banner.length);
	rand2 = rand + Math.floor(Math.random()*2) + 1;
	if(rand2 >= banner.length){rand2 -= banner.length}
	document.write("<a href="+link[rand]+"><img alt="+message[rand]+" src="+banner[rand]+" style='border-style:none' class='saleBnr'></a>");
	document.write("<a href="+link[rand2]+"><img alt="+message[rand2]+" src="+banner[rand2]+" style='border-style:none' class='saleBnr'></a>");
}