Possible Answers

1. <A HREF="somelink.html" onmouseover="document.bgColor='#FF0000';window.status='Dangerous color'" onmouseout="document.bgColor='#FFFFEE'">Link</A>
   

   Check the result: Link

2. <A HREF="somelink.html" onmouseover="document.bgColor='#FF0000';alert('Dangerous color')" onmouseout="document.bgColor='#FFFFEE'">Link</A>
   

   Check the result: Link