navigatie

<?php
$nav == $_GET['nav'];

if($nav == '')
{
include('start.php'); 
}

elseif($nav == '1')
{
include('home.php'); 
}
?>

<?php
$nav == $_GET['nav'];
 
if($nav == '')
{
include('start.php'); 
}
 
elseif($nav == '1')
{
include('home.php'); 
}
?>

<div id="start" style="position: absolute; visibility: show; top:150; left:350;">
<a href="index.php?nav=1"><img src="images/start.gif" alt="" border="0"></a>
</div>

<div id="start" style="position: absolute; visibility: show; top:150; left:350;">
<a href="index.php?nav=1"><img src="images/start.gif" alt="" border="0"></a>
</div>

<?php
$nav = $_GET['nav'];

if($nav == '')
{
$nav = '0'; 
}

elseif($nav == '0')
{
include('start.php'); 
}

elseif($nav == '1')
{
include('home.php'); 
}
?>

<?php
$nav = $_GET['nav'];
 
if($nav == '')
{
$nav = '0'; 
}
 
elseif($nav == '0')
{
include('start.php'); 
}
 
elseif($nav == '1')
{
include('home.php'); 
}
?>

<?php
if (!isset ($_GET['nav']))
{
    $_GET['nav'] = '';
}

switch ($_GET['nav'])
{
    case '': case '0':
        include 'start.php';
    break;
    case '1':
        include 'home.php';
}

<?php
if (!isset ($_GET['nav']))
{
    $_GET['nav'] = '';
}
 
switch ($_GET['nav'])
{
    case '': case '0':
        include 'start.php';
    break;
    case '1':
        include 'home.php';
}