Using Sessions to Make a Login Script

[rogesjhone]

<?
require ("config.php");
session_start();
if ((!$username) || (!$password)) {
echo '<form name=login method=post action="">
user:<input type=text name=username><br>
pass:<input type=text name=password><br>
<input type=submit value=go>
</form>';
}
else {
if ($username=="$uname") {
session_register("username");
session_register("password");
echo "user is $uname, and password is $pword
<br> <a href=\"?m=1\" >unreg</a>";
}
else echo "nope";
}
if ($m==1) {
session_unregister("username");
session_unregister("password");
}
?>