@charset "utf-8";
/* CSS Document */

.back-to-top {
position: fixed;
bottom: 25px;
right: 25px;
/*link to your image, use correct path, if in doubt, use full path with http://...*/
background: url('http://www.plastic2goindonesia.com/images/arrows.png') left top no-repeat; 
width: 25px;
height: 23px;
}

.back-to-top a {
text-indent: -9999px;
display: block;
}

.back-to-top:hover { 
/*link to your image, use correct path, if in doubt, use full path with http://...*/
background:url('http://www.plastic2goindonesia.com/images/arrows.png') left -23px no-repeat; 
}