function highlightRating(r) {

	for (i=1;i<=r;i=i+1) {
		document.getElementById('star_' + i).src = 'images/stars/star_big_' + i + '.gif'
	}
	
	for (u=i;u<=6;u=u+1) {
		document.getElementById('star_' + u).src = 'images/stars/star_grey_big_' + u + '.gif'
	}
	
}