WampServer

I've just installed WAMP5 with all default settings, but i can't using $_SESSION variable.
Here's my two code pages:

change.php:

//Begin code
<?php
if (!isset($_SESSION['count']))
{
session_start();
$_SESSION['count']=0;
print $_SESSION['count'];
print "<a href=delete.php>delete</a>";
}
else
{
session_start();
$_SESSION['count']++;
print $_SESSION['count']++;
print "<a href=delete.php>delete</a>";
}
?>
//End code

delete.php

//Begin code
<?php
if (!isset($_SESSION['count']))
{
session_start();
$_SESSION['count']=0;
print $_SESSION['count'];
print "<a href=change.php>Change</a>";
}
else
{
session_start();
$_SESSION['count']++;
print $_SESSION['count']++;
print "<a href=change.php>Change</a>";
}
?>
//End code

But, it seem does nothing when i refresh these pages nor clicking on the links (all results are only 0). Can anyone help me?
Thank your advice!

Thats becaus session start must be befor eeverything. Try these:

change.php:

//Begin code
<?php
session_start();
if (!isset($_SESSION['count']))
{
$_SESSION['count'] = 0;
print $_SESSION['count'];
print "<a href=delete.php>delete</a>";
}
else
{
$_SESSION['count']++;
print $_SESSION['count']++;
print "<a href=delete.php>delete</a>";
}
?>
//End code

delete.php

//Begin code
<?php
session_start();
if (!isset($_SESSION['count']))
{
$_SESSION['count'] = 0;
print $_SESSION['count'];
print "<a href=change.php>Change</a>";
}
else
{
$_SESSION['count']++;
print $_SESSION['count']++;
print "<a href=change.php>Change</a>";
}
?>
//End code

Thank you so much! It helps!