function roll_over(img_name, img_src){
   document[img_name].src = img_src;
}


function ratings_highlight(img_name, img_src){
   
   if(img_name == 'star1'){
      document['star1'].src = img_src;
   }
   
   if(img_name == 'star2'){
      document['star1'].src = img_src;
      document['star2'].src = img_src;
   }
   
   if(img_name == 'star3'){
      document['star1'].src = img_src;
      document['star2'].src = img_src;
      document['star3'].src = img_src;
   }

   if(img_name == 'star4'){
      document['star1'].src = img_src;
      document['star2'].src = img_src;
      document['star3'].src = img_src;
      document['star4'].src = img_src;
   }
   
   if(img_name == 'star5'){
      document['star1'].src = img_src;
      document['star2'].src = img_src;
      document['star3'].src = img_src;
      document['star4'].src = img_src;
      document['star5'].src = img_src;
   }
}

function ratings_reset(img_src1, img_src2, img_src3, img_src4, img_src5){
   
   document['star1'].src = img_src1;
   document['star2'].src = img_src2;
   document['star3'].src = img_src3;
   document['star4'].src = img_src4;
   document['star5'].src = img_src5;
}