removing a divider line at the end of a nav menu

Hey,

Probably a simple solution to this, but am currently surfing around for one. Right now i’m using this tag to show a top horizontal navigation menu:

<?php wp_page_menu('exclude=35,57'); ?>

and this css to style it

#nav li {
	display: inline;
	margin: 0 5px 0 5px;
	padding: 0 10px 0 0;
	border-right: 1px solid black;
}

So I get:

option 1 | option 2 | option 3 | option 4 |

normally to get rid of the last divider line, I would make a class and apply it to the last element:

.last { border-right: none;}

So I get:

option 1 | option 2 | option 3 | option 4

How do I go about that using that above wordpress tag?

Thanks!

Nadine.