function get_random ()
{
	var ranNum= Math.round (Math.random () *39) ;
	return ranNum;
}

function getimage()
{
	var whichimage = get_random();

		var image = new Array (39);
		image[0] = "images/logo/01.png";
		image[1] = "images/logo/02.png";
		image[2] = "images/logo/03.png";
		image[3] = "images/logo/04.png";
		image[4] = "images/logo/05.png";
		image[5] = "images/logo/06.png";
		image[6] = "images/logo/07.png";
		image[7] = "images/logo/08.png";
		image[8] = "images/logo/09.png";
		image[9] = "images/logo/10.png";
		image[10] = "images/logo/11.png";
		image[11] = "images/logo/12.png";
		image[12] = "images/logo/13.png";
		image[13] = "images/logo/14.png";
		image[14] = "images/logo/15.png";
		image[15] = "images/logo/16.png";
		image[16] = "images/logo/17.png";
		image[17] = "images/logo/18.png";
		image[18] = "images/logo/19.png";
		image[19] = "images/logo/20.png";
		image[20] = "images/logo/21.png";
		image[21] = "images/logo/22.png";
		image[22] = "images/logo/23.png";
		image[23] = "images/logo/24.png";
		image[24] = "images/logo/25.png";
		image[25] = "images/logo/26.png";
		image[26] = "images/logo/27.png";
		image[27] = "images/logo/28.png";
		image[28] = "images/logo/29.png";
		image[29] = "images/logo/30.png";
		image[30] = "images/logo/31.png";
		image[31] = "images/logo/32.png";
		image[32] = "images/logo/33.png";
		image[33] = "images/logo/34.png";
		image[34] = "images/logo/35.png";
		image[35] = "images/logo/36.png";
		image[36] = "images/logo/37.png";
		image[37] = "images/logo/38.png";
		image[38] = "images/logo/39.png";
		image[39] = "images/logo/40.png";
		
		document.images['img'].src = image[whichimage];
}