The latest versions of rsobj.php include Cross Site Scripting protection. This will display html code instead of rendering it on the page. To override that and display html, you have to change your reference on the page from:
<?php echo($rsTopNav->getColumnVal("SiteDesc")); ?>
to:
<?php echo($rsTopNav->getColumnVal("SiteDesc",false)); ?>
The extra "false" argument tells it to ignore cross site scripting and render any code stored.