function setImage(theId) {
	if (document.getElementById(theId)) {
		var l = window['pictures_' + theId].length;
		var rnd_no = Math.floor(l*Math.random());
		
		document.getElementById(theId).src = window['pictures_' + theId][rnd_no];
		document.getElementById(theId).alt = window['alt_' + theId][rnd_no];
		document.getElementById(theId).title = window['title_' + theId][rnd_no];
	}
}