[Breixo]

Thanks for your quick reply.
I was trying to use it but I can't find a way:
My ads are shown using vbulletin ad manager:

<div id="ad_global_below_navbar">

On register.php I found:

<script type="text/javascript">
<!--
	var SESSIONURL = "";
	var SECURITYTOKEN = "guest";
	var IMGDIR_MISC = "http://xxxxxxxxxxxxx";
	var IMGDIR_BUTTON = "http://xxxxxxxxxxxxx";
	var vb_disable_ajax = parseInt("0", 10);
	var SIMPLEVERSION = "412";
	var BBURL = "http://xxxxxxxxxxxxx";
	var LOGGEDIN = 0 > 0 ? true : false;
	var THIS_SCRIPT = "register";
        var RELPATH = "register.php";
        var PATHS = {forum : ""}
// -->
</script>

I tried to change it to

<vb:if condition="THIS_SCRIPT != 'register'">Don't show on register.php</vb:if>

But I don't know the right place to add this code in order to remove ads.
Thanks for your time!