//numpage.php
<?php
session_start();
class numpage{
function numpage(){
if (!isset($_SESSION['page'])){
$_SESSION['page'] = 1;
}else{
if (isset($_GET['pagemode'])){
if ($_GET['pagemode']=="anterior"){
$_SESSION['page']--;
if ($_SESSION['page']<1){
$_SESSION['page']=1;
}
}
if ($_GET['pagemode']=="siguiente"){
$_SESSION['page']++;
if ($_SESSION['page']>6){
$_SESSION['page']=6;
}
}
}
}
print '<div id="page">'.$_SESSION['page'].'</div>';
}
}
?>
//index.php
<?php
include('numpage.php');
$num = new numpage();
?>
<a href="index.php?pagemode=anterior"><button>Anterio r</button></a>
<a href="index.php?pagemode=siguiente"><button>Siguie nte</button></a>
<div style="" id="page1">Hola</div>
<div style="" id="page2">Buenas</div>
<div style="" id="page3">Probando</div>
<div style="" id="page4">Codigo</div>
<div style="" id="page5">PHP</div>
<div style="" id="page6">Ja</div>
<script>
var p = document.getElementById('page').innerHTML;
document.getElementById('page'+String(p)).style.co lor = "#00F";
document.getElementById('page'+String(p)).style.te xtDecoration = "underline";
</script>