HTML Attributes for <AREA ...>
onMouseOver ="script command(s)"
onMouseOut ="script command(s)"

Usage Recommendation
Use it, but don't rely on it.

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onMouseOver and onMouseOut work similar to their counterparts in <A ...>. These event handlers are triggered when the mouse moves over the area(onMouseOver) and when it moves out from being over the area (onMouseOut). 

<AREA HREF="freelance.html" ALT="Freelance" 
 COORDS="31,0,164,26" SHAPE=RECT 
onMouseOver="alert('Mouse Over!')">

gives us Freelance Albums Jobs Log Out Home image Map 

<AREA HREF="freelance.html" ALT="Freelance" 
 COORDS="31,0,164,26" SHAPE=RECT 
onMouseOut="alert('Mouse Out!')">

gives us Freelance Albums Jobs Log Out Home image Map

<SPACER ...> >