$(document).ready(function() {

  $("#boton1").hover(function(){
 $("#boton1 img").stop()
 $("#boton1 img").animate({opacity:0},500)
 },
 function(){
 $("#boton1 img").stop()
 $("#boton1 img").animate({opacity:1},500)
 }
 );
 
   $("#boton2").hover(function(){
 $("#boton2 img").stop()
 $("#boton2 img").animate({opacity:0},500)
 },
 function(){
 $("#boton2 img").stop()
 $("#boton2 img").animate({opacity:1},500)
 }
 );
 
    $("#boton3").hover(function(){
 $("#boton3 img").stop()
 $("#boton3 img").animate({opacity:0},500)
 },
 function(){
 $("#boton3 img").stop()
 $("#boton3 img").animate({opacity:1},500)
 }
 );
 
    $("#boton4").hover(function(){
 $("#boton4 img").stop()
 $("#boton4 img").animate({opacity:0},500)
 },
 function(){
 $("#boton4 img").stop()
 $("#boton4 img").animate({opacity:1},500)
 }
 );
 
 
    $("#boton5").hover(function(){
 $("#boton5 img").stop()
 $("#boton5 img").animate({opacity:0},500)
 },
 function(){
 $("#boton5 img").stop()
 $("#boton5 img").animate({opacity:1},500)
 }
 );

    $("#boton6").hover(function(){
 $("#boton6 img").stop()
 $("#boton6 img").animate({opacity:0},500)
 },
 function(){
 $("#boton6 img").stop()
 $("#boton6 img").animate({opacity:1},500)
 }
 );
 
     $("#boton7").hover(function(){
 $("#boton7 img").stop()
 $("#boton7 img").animate({opacity:0},500)
 },
 function(){
 $("#boton7 img").stop()
 $("#boton7 img").animate({opacity:1},500)
 }
 );
 
     $("#boton8").hover(function(){
 $("#boton8 img").stop()
 $("#boton8 img").animate({opacity:0},500)
 },
 function(){
 $("#boton8 img").stop()
 $("#boton8 img").animate({opacity:1},500)
 }
 );
 

});