CSS
#reviewStars-input input:checked ~ label, #reviewStars-input label,
#reviewStars-input label:hover, #reviewStars-input label:hover ~ label {
background: url('http://positivecrash.com/wp-content/uploads/ico-
s71a7fdede6.png') no-repeat;}

#reviewStars-input {
overflow: hidden;
zoom: 1;
position: relative;
float: left;}

#reviewStars-input input {
opacity: 0;
width: 43px;
height: 40px;
position: absolute;
top: 0;
z-index: 0;}

#reviewStars-input input:checked ~ label {
background-position: 0 -40px;
height: 40px;
width: 43px;}

#reviewStars-input label {
background-position: 0 0;
height: 40px;
width: 43px;
float: right;
cursor: pointer;
margin-right: 10px;
position: relative;
z-index: 1;}

#reviewStars-input label:hover, #reviewStars-input label:hover ~ label {
background-position: 0 -40px;
height: 40px;
width: 43px;}

#reviewStars-input #star-0 {
left: 0px;}

#reviewStars-input #star-1 {
left: 53px;}

#reviewStars-input #star-2 {
left: 106px;}

#reviewStars-input #star-3 {
left: 159px;}

#reviewStars-input #star4 {
left: 212px;}

#reviewStars-input #star-5 {
left: 265px;}

Html
<div id="reviewStars-input">
<input id="star4" type="radio" name="reviewStars"  />
<label title="5" for="star4"></label>
<input id="star-3" type="radio" name="reviewStars"/>
<label title="4" for="star-3"></label>
<input id="star-2" type="radio" name="reviewStars"/>
<label title="3" for="star-2"></label>
<input id="star-1" type="radio" name="reviewStars"/>
<label title="2" for="star-1"></label>
<input id="star-0" type="radio" name="reviewStars"/>
<label title="1" for="star-0"></label>
</div>

JS


window.onload = function(){
if (localStorage.getItem('startr')!==null)
var image = localStorage.getItem('startr');
document.getElementsByTagName('star-1')[0].style.background = image;

document.getElementById('star4').onclick = function(){
    console.log('work');
    document.getElementsByTagName('star4')[0].style.background =
'http://positivecrash.com/wp-content/uploads/ico-s71a7fdede6.png';
    localStorage.setItem('startr','http://positivecrash.com/wp-
content/uploads/ico-s71a7fdede6.png');
}
}