alert system

[Heinous]

If your doing it via IP Alert just do

<?
$_SERVER[REMOTE_ADDR];
if ($ip == "99.99.99,99) { echo" alert("lol"); } else { } ?>

Hm, wrong. Way wrong.

<?php
$ip = $_SERVER['REMOTE_ADDR'];
if ($ip == "x.x.x.x")
  {
     echo "<script type=\"text/javascript\">
             <!--
             alert(\"message\");
             //-->
             </script>
             ";
   }
?>