I am trying to do the following but having issues.

I would like to insert a specific div tag in my page.tpl.php when the url alias contains yepp for example when www.domain.com/yepp or www.domain.com/yepp/page1

If I try using arg(0) it just returns the internal system path "node".

There is more than one way of doing this.

Here is a simple one:

$a = explode('/', check_plain($_SERVER['REQUEST_URI']));
if ($a[1] == 'yepp') {
// Go wild
}