Note that I deleted the quotation marks in Brendy's defective link above. Quote marks within links are optional, and they cause problems if you don't do 'em right - so it's better not to use them. The simpler you can make your HTML, the better. I've noticed that in most HTML tags, quote marks are optional but are often used - I haven't experimented enough to know whether it's safe to say that quote marks are almost always optional within HTML tags, but it seems to me that may be the case.

<a href=http://www.mudcat.org/>Click here</a>