Instead of changing the theme through the query just do a variable that can represent the theme. Therefore, it could be easily changed such as
$theme = "blue";
mysql_query("UPDATE `site_info` SET `template` = '$theme'");
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That should work out better, anyways really nice theme and keep up...
Since we provide 1gbps, it will be required something powerful to ddos your hotel, and nothing will happen, what i mean't aslong as you don't ddos from your VPS hosted from us, you'll be fine.