$(function(){
	var star_span = $('span.star-num');
	var star_pos = '0px -160px';
	star_span.each(function(i){
		var _this = this;
		var $this = $(this);
		var star_num = parseFloat($this.text());
		$this.css('background-position',star_pos);
		for (var i=0; i<=5; i++){
			if(star_num==i){
				var pos_y = '0px '+16*(i*2-10)+'px';
				$this.css('background-position',pos_y);
			}else if(star_num>i && star_num<(i+1)){
				var pos_y = '0px '+16*(i*2-9)+'px';
				$this.css('background-position',pos_y);
			}
		}
	});
});