$(document).ready(function(){
     $('img#nav1').mouseover(function() {
        $(this).attr("src","img/bt-saiba-mais-over.jpg");
     });
     $('img#nav1').mouseout(function() {
        $(this).attr("src","img/bt-saiba-mais.jpg");
     });
});

$(document).ready(function(){
     $('img#nav2').mouseover(function() {
        $(this).attr("src","img/bt-saiba-mais-over.jpg");
     });
     $('img#nav2').mouseout(function() {
        $(this).attr("src","img/bt-saiba-mais.jpg");
     });
});

$(document).ready(function(){
     $('img#nav3').mouseover(function() {
        $(this).attr("src","img/bt-saiba-mais-over.jpg");
     });
     $('img#nav3').mouseout(function() {
        $(this).attr("src","img/bt-saiba-mais.jpg");
     });
});

$(document).ready(function(){
     $('img#nav4').mouseover(function() {
        $(this).attr("src","img/bt-saiba-mais-over.jpg");
     });
     $('img#nav4').mouseout(function() {
        $(this).attr("src","img/bt-saiba-mais.jpg");
     });
});

$(document).ready(function(){
     $('img#voltar').mouseover(function() {
        $(this).attr("src","img/bt-voltar-over.jpg");
     });
     $('img#voltar').mouseout(function() {
        $(this).attr("src","img/bt-voltar.jpg");
     });
});


$(document).ready(function(){
     $('img#navtopo').mouseover(function() {
        $(this).attr("src","img/bt-topo-over.jpg");
     });
     $('img#navtopo').mouseout(function() {
        $(this).attr("src","img/bt-topo.jpg");
     });
});

$(document).ready(function(){
     $('img#anterior').mouseover(function() {
        $(this).attr("src","img/bt-anterior-over.jpg");
     });
     $('img#anterior').mouseout(function() {
        $(this).attr("src","img/bt-anterior.jpg");
     });
});

$(document).ready(function(){
     $('img#proximo').mouseover(function() {
        $(this).attr("src","img/bt-proximo-over.jpg");
     });
     $('img#proximo').mouseout(function() {
        $(this).attr("src","img/bt-proximo.jpg");
     });
});


$(document).ready(function(){
     $('input#nav6').mouseover(function() {
        $(this).attr("src","img/bt-enviar-over.jpg");
     });
     $('input#nav6').mouseout(function() {
        $(this).attr("src","img/bt-enviar.jpg");
     });
});

/*$(document).ready(function(){
     $('img#nav4').mouseover(function() {
        $(this).attr("src","images/bt-participe-chamada-over.jpg");
     });
     $('img#nav4').mouseout(function() {
        $(this).attr("src","images/bt-participe-chamada.jpg");
     });
});

$(document).ready(function(){
     $('img#nav5').mouseover(function() {
        $(this).attr("src","images/bt-conferir-regulamento-over.jpg");
     });
     $('img#nav5').mouseout(function() {
        $(this).attr("src","images/bt-conferir-regulamento.jpg");
     });
});

x

$(document).ready(function(){
     $('img#nav7').mouseover(function() {
        $(this).attr("src","images/twitter-over.gif");
     });
     $('img#nav7').mouseout(function() {
        $(this).attr("src","images/twitter.gif");
     });
});

$(document).ready(function(){
     $('img#nav8').mouseover(function() {
        $(this).attr("src","images/bt-topo-over.gif");
     });
     $('img#nav8').mouseout(function() {
        $(this).attr("src","images/bt-topo.gif");
     });
});

$(document).ready(function(){
     $('img#nav9').mouseover(function() {
        $(this).attr("src","images/bt-topo-cadastro-over.gif");
     });
     $('img#nav9').mouseout(function() {
        $(this).attr("src","images/bt-topo-cadastro.gif");
     });
});*/