var img_list = "test.jpg, note_big.jpg, kol_big.jpg, korz_big.jpg";

function printRandImage(imagesF){
	img_arr = img_list.split(", ");
	rk = Math.floor(Math.random()* img_arr.length);

	img_src = imagesF + img_arr[rk];
	document.write("<img alt='' src='" +img_src+ "' />");
}