I got the twitter bootstrap dropdown buttons successfully working, but I have a tiny problem. The black navbar here:
http://twitter.github.com/bootstrap/javascript.html#
Assuming you're referring to the white arrow that points upward when a menu item is clicked, the style you're looking for is on line 3907 in bootstrap.css:
.navbar .dropdown-menu::after {
position: absolute;
top: -6px;
left: 10px;
display: inline-block;
border-right: 6px solid transparent;
border-bottom: 6px solid white;
border-left: 6px solid transparent;
content: '';
}
You can try copying this style and removing the .navbar
portion of the style declaration and modify it to fit your code.