Setting anchor points
<a name=top></a>
Jump on the same page
<a href=#top>Back to top</a>
Jump on different pages
<a href=test.htm#top>Skip to the top of the test.htm page</a>
By the way, I have never known about mailto and the attributes added by the subject subject before.
A complete mailto syntax is like this <a href=mailto:[email protected]?subject=This is the subject of the email>Write me</a>