Dropdown Menu - Expand Left
HTML
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap.min.css">
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu" style="display: block; position: static; margin-bottom: 5px; *width: 180px;">
<li><a tabindex="-1" href="#">Action</a></li>
<li><a tabindex="-1" href="#">Another action</a></li>
<li><a tabindex="-1" href="#">Something else here</a></li>
<li class="divider"></li>
<li class="dropdown-submenu">
<a tabindex="-1" href="#">More options</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">Second level link</a></li>
<li><a tabindex="-1" href="#">Second level link</a></li>
<li><a tabindex="-1" href="#">Second level link</a></li>
<li><a tabindex="-1" href="#">Second level link</a></li>
<li><a tabindex="-1" href="#">Second level link</a></li>
</ul>
</li>
</ul>
CSS
.dropdown-menu
{
float:left;
}
.dropdown-submenu > .dropdown-menu
{
right: -95%;
border-radius: 6px 0px 6px 6px;
}