Dumb question for the day...

If I have an unordered list like this...

Code HTML4Strict:
<ul id="nav">
	<li><a href="#">Men's</a></li>
	<li><a href="#">Women's</a>
	<li><a href="#">Boys'</a>
	<li><a href="#">Girls'</a>
</ul>

Then why does it display like this...

Men's Women's Boys' Girls'

And not like this...

Men's
Women's
Boys'
Girls'

Debbie