Creating broken horizontal rule

I havee 开发者_运维技巧been looking at the source and stylesheet for the following address to work out how you can make a ... be "surrounded" by a broken horizontal rule. At the page http://www.joindiaspora.com/ there is a navigation menu having an example of it. In the html source there is used no

Yes, it's with CSS, not an HR. There's a border-bottom on the #header DIV, and the #floating_nav is simply positioned over it. That nav contains a SPAN with a solid white background which covers the middle part of the border.