gistfile1.js

jQuery.fn.ratingSelector = function(){
	return $(this).each(function(){
		var stars_element = null,
		rating_element = null;                     
		stars_element = $(this).find('span.rating_stars');
		rating_element = $(this).find('input');
		if (stars_element.size() && rating_element.size())
		stars_element.click(function(ev){
			var stars_coords = stars_element.offset();
			var offset = ev.pageX - stars_coords.left;
			var rating = Math.ceil(offset/(stars_element.width()/5));
			stars_element.attr('class', 'rating_stars rating_'+rating);
			rating_element.val(rating);
		})
	})
}

$('#rating_selector').ratingSelector();