<a href="http://www.yahoo.com>Link to Yahoo</a>
The text, "Link to Yahoo" can be replaced with an image or whatever the author wishes.

There are some tags that can be placed within the link tag which designate where the 
link's target page will appear.

target="_blank" - This tag opens the link in a new browser window.

target="_parent" - This tag opens the link in the same window in which it was originally 
clicked.

target="_framename"

Ex. <a href="links.html" target="_blank">