myArray = new Array ();
	myArray[0] = '<img src="/lsc/images/rotation/promotion01.jpg" alt="生命科学部" width="513" height="228" />';
	myArray[1] = '<img src="/lsc/images/rotation/promotion02.jpg" alt="生命科学部" width="513" height="228" />';
	var randolf = (Math.round(Math.random() * (myArray.length - 1)));
	document.write(myArray[randolf]);