<script type="text/javascript">
  $(function(){

         $("ul a").click(function(){
            pagina = $(this).attr('href')

            $("#meio").load(pagina);
            return false;
         })
})
  </script>

 <div id="meio" style="width:768px; margin:0 auto; overflow:scroll;height:100%;"></div>

<script type="text/javascript">
var pagina = "";
<!-- aqui vc muda o tempo de espera -->
var espera = 10;

function mostra(){
if(tempo < 1){
  if(pagina != "publicidade"){
    pagina = "publicidade";
$("#meio").load("publicidade.php");
  }
}
else{
tempo --;
}
}
var tempo = espera;
$(document).scroll(function(){
                tempo = espera;
                });
$(document).mousemove(function(){
                tempo = espera;
                });
$(document).click(function(){
                tempo = espera;
                });
$(document).mousedown(function(){
                tempo = espera;
                });
$(document).ready(function(){
               setInterval(mostra, 1000);

               });
</script>

<script type="text/javascript">

    $(document).ready(function(){
    $("#slide").click(function(){
      $("#meio").load("menu.php");
      pagina = "";
      tempo = espera;
                              });
});
</script>

<script type="text/javascript">
$(function(){
            $('#slides').slides({
                preload: false,
                preloadImage: 'img/loading.gif',
                play: 10000,
                hoverPause: false,
                animationStart: function(current){
                    $('.caption').animate({
                        bottom:-35
                    },100);
                    if (window.console && console.log) {
                        // example return of current slide number
                        console.log('animationStart on slide: ', current);
                    };
                },
                animationComplete: function(current){
                    $('.caption').animate({
                        bottom:0
                    },200);
                    if (window.console && console.log) {
                        // example return of current slide number
                        console.log('animationComplete on slide: ', current);
                    };
                },
                slidesLoaded: function() {
                    $('.caption').animate({
                        bottom:0
                    },200);
                }
            });
        });

</script>

<script>
    $(document).on('click', function(){

        $("#meio").load('menu.php');
    })
</script>