Ban guests and a user from seeing nav-bar

This is a code I quickly wrote which hides the nav-bar from guests, and you can make it do it to a member as well.

This is to go into the global headers or any the board you want this to affect.

<script type="text/javascript">
<!--
//Created by Luke Mansell copyright.
// coderCommunity.proboards.com

// This next bit is to stop guests from seeing the nav-bar
if(pb_username=="Guest"){
document.getElementsByTagName("td")[3].style.display = "none";
document.write("<center>To view our nav-bar please login or register</center>");
}

//You can ban a member from seeing the nav bar
if(pb_username=="markl"){
document.getElementsByTagName("td")[3].style.display = "none";
}
//-->
</script>

Change the red to the username you want banned from seeing the nav-bar. The rest shouldn't be touched.