#

It means to go to the anchor with name "layer".

hongjun

Just like below
http://www.nus.edu.sg/gem/about_faq.htm#21

check out anchor name
http://www.w3schools.com/html/html_links.asp

hongjun

It is used to have links on the same page. So somewhere in the source of page.html is a
<a name="layer"></a>

And by clicking on the link "page.html#layer" you will have that exact place on the page in your browser, not just the top of that page.

If you want to create links within a page you can accomplish it by using <a href="page.html#layer">
A small example for you to make it understand better

<a href="page.html#book1">Go to book 1 section</a>   : When you click this link it will take you to a book 1 section on page even if its all the way on the bottom of the page
<a href="page.html#book2">Go to book 2 section</a>
<a href="page.html#book3">Go to book 3 section</a>

<a name="book1">Book 1 section</a>
<a name="book2">Book 1 section</a>
<a name="book3">Book 1 section</a>

assuming Zonstar ;) forgot to return false on an accident

<p><a href="#" onclick="alert("Hi there!");return false;">Click here for a useless message</a>.</p>

and used double quota's in a single quotas place

<p><a href="#" onclick="alert('Hi there!');return false;">Click here for a useless message</a>.</p>