An xHTML valid version of what driv posted would be:
HTML
<a href="http://www.example.com"><img src="http://www.example.com/example.jpg" /></a>

Though his example's ending a tag is miss-written and should be:
HTML
<a href="http://www.example.com"><img src="http://www.example.com/example.jpg"></a>

There are many examples posted on this forum as well if you use the search function.

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