Won't sit right...

Call me stupid, but I really can't seem to suss this out XD

I installed a rating script, but now it won't sit right. The filled stars (that appear after a vote) are sitting on top of the blank stars.
http://www.starrydollz.com/graphics/randomlyts1.php

It's to do with the CSS somehow, but everytime I try to fix it all I do is remove the blank stars, and that's no use to anyone >_<

Quote

.ratingblock {
   display:block;
   border-bottom:1px solid #999;
   padding-bottom:8px;
   margin-bottom:8px;
   }

.loading {
   height: 30px;
   background: url('http://www.starrydollz.com/rate/images/working.gif') 50% 50% no-repeat;
   }

.unit-rating { /* the UL */
   list-style:none;
   margin: 0px;
   padding:0px;
   height: 30px;
   position: relative;
   background: url('http://www.starrydollz.com/rate/images/starrating.gif') top left repeat-x;
   }

.unit-rating li{
text-indent: -90000px;
   padding:0px;
   margin:0px;
   /*\*/
   float: left;
   /* */
   }

.unit-rating li a {
   outline: none;
   display:block;
   width:30px;
   height: 30px;
   text-decoration: none;
   text-indent: -9000px;
   z-index: 20;
   position: absolute;
   padding: 0px;
   }

.unit-rating li a:hover{
   background: url('http://www.starrydollz.com/rate/images/starrating.gif') left center;
   z-index: 2;
   left: 0px;
   }

.unit-rating a.r1-unit{left: 0px;}
.unit-rating a.r1-unit:hover{width:30px;}
.unit-rating a.r2-unit{left:30px;}
.unit-rating a.r2-unit:hover{width: 60px;}
.unit-rating a.r3-unit{left: 60px;}
.unit-rating a.r3-unit:hover{width: 90px;}
.unit-rating a.r4-unit{left: 90px;}
.unit-rating a.r4-unit:hover{width: 120px;}
.unit-rating a.r5-unit{left: 120px;}
.unit-rating a.r5-unit:hover{width: 150px;}

.unit-rating li.current-rating {
   background: url('http://www.starrydollz.com/rate/images/starrating.gif') left bottom;
   position: absolute;
   height: 30px;
   display: block;
   text-indent: -9000px;
   z-index: 1;
   }

.voted {color:#999;}
.thanks {color:#36AA3D;}
.static {color:#5D3126;}

/edit/
&& I just checked it in firefox, and it doesn't show the images at all! Any ideas how to fix that?
IE:

FireFox:

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