<?php
$s = $_GET["s"];
if($s) {
$hent_b = mysql_query("SELECT * FROM member_battles WHERE state = '1' ORDER BY id DESC LIMIT 0,200") or die(mysql_error());
}else{
$hent_b = mysql_query("SELECT * FROM member_battles WHERE state = '0' ORDER BY id DESC LIMIT 0,200") or die(mysql_error());
}
while($vis = mysql_Fetch_array($hent_b)) {
 ?> 

I have this now i want when i enter my site (index.php) it should not come up undefined $_GET["s"];

how do i do this? but i want when you do index.php?s then it should change the query