Shoutbox

I use it on my website too, I have it like this

I hope it's secure else tell me how to make it better

code:

---

function pagina ($page){
   $pad = "paginas/".$page.".php";
   if(!file_exists($pad))
   {
      include("paginas/notfound.php");
   }
   else
   {
      include($pad);
   }
}
if(!isset($_GET["pagina"]) OR $_GET["pagina"] == "")
{
   pagina("home");
}
else
{
   pagina($_GET["pagina"]);
}

---

Edit: Automatic coloring would be nice