function starsOn(starID) {

   var star = starID.split("star",2);
   var count = 0;

   for (i=0; i < star[1]; i++) {
   
      count++;
      eval("document.getElementById('star"+count+"').src = '/images/icon-star-on.png'");      
      
   }

}

function starsOff() {

   var count = 0;
           
   for (i=0; i < 5; i++) {

      count++;
      eval("document.getElementById('star"+count+"').src= '/images/icon-star-off.png'");
          
   }

}