function ShowRandomBanner() {
	aImages						= new Array();

	aImages[0]					= new Object();
	aImages[0].src				= "img/sp_main.gif";
	aImages[0].href				= "http://www.tellmeclub.com/tmc/feature/honolulumarathon/index.html";

	aImages[1]					= new Object();
	aImages[1].src				= "img/sp_main2.gif";
	aImages[1].href				= "http://www.tellmeclub.com/tmc/feature/honolulumarathon/index.html";

	// ランダム数字を格納
	Myrand = Math.floor(Math.random() * (aImages.length) );

	elem						= document.getElementById("h2_sp_main");
	elem.style.backgroundImage	= 'url(' + aImages[ Myrand ].src + ')'; 
	elem.href					= aImages[ Myrand ].href;
}