whats wrong with this image marquee code??

<marquee behavior=scroll direction="left"><a href="http://www.eminem.com><img src="nana.gif width="150 "height="50" border="0" alt="nana"></a></marquee>

You didn't end your quotes

<marquee behavior=scroll direction="left"><a href="http://www.eminem.com"><img src="nana.gif" width="150" "height="50" border="0" alt="nana"></a></marquee>