#btnNext{
  background:url(../img/setaD.png);
  width:40px; height:40px; position:relative; float:right; opacity:0.4;
  transition:all 5s ease-in-out;
  -moz-transition:all 5s ease-in-out;
  -webkit-transition:all 1s ease-in-out;
}

#btnPrev{
  background:url(../img/setaE.png);
  width:40px; height:40px; position:relative; float:left; opacity:0.4;
  transition:all 5s ease-in-out;
  -moz-transition:all 5s ease-in-out;
  -webkit-transition:all 1s ease-in-out;
}

#btnNext:hover{
  background:url(../img/setaDH.png);
  width:40px; height:40px; position:relative; float:right;
}

#btnPrev:hover{
  background:url(../img/setaEH.png);
  width:40px; height:40px; position:relative; float:left;
  
}