function pick_photo(numberOfPhotos, photoName, photoSource, photoId, photoHeight, photoWidth) {
	var photoNumber = Math.floor(Math.random()*numberOfPhotos);
	document.write('<img name="', photoName, '" src="', photoSource, photoNumber, '.jpg" alt="" id="', photoId, '" height="', photoHeight, '" width="', photoWidth, '" />');
}

pick_photo(13, "page_photo_1", "img/photos/content/343x197/npac_photo_", "page_photo_1", "197px", "343px");
pick_photo(17, "page_photo_2", "img/photos/content/314x197/npac_photo_", "page_photo_2", "197px", "314px");
pick_photo(17, "page_photo_3", "img/photos/content/205x197/npac_photo_", "page_photo_3", "197px", "205px");