HTML Attribute for <IMG ...>
USEMAP

Looking for info on how to make an image map? - See our tutorial How to Make an image Map

USEMAP indicates that the image is an image map and uses the map definition named by this attribute. The name of the map is set by the NAME attribute of the <MAP ...> tag. note that USEMAP requires that you precede the name of the map with a hash symbol (#). For example, the following code creates an image map named map1: 

<DIV ALIGN=CENTER>
<MAPNAME="map1">
<AREA 
 HREF="contacts.html" ALT="Contacts" TITLE="Contacts" 
 SHAPE=RECT COORDS="6,116,97,184">
<AREA 
 HREF="products.html" ALT="Products" TITLE="Products" 
 SHAPE=CIRCLE COORDS="251,143,47">
<AREA 
 HREF="new.html" ALT="New!" TITLE="New!" 
 SHAPE=POLY COORDS="150,217, 190,257, 150,297,110,257">
</MAP>
<IMG SRC="testmap.gif" 
 ALT="map of GH site" BORDER=0 WIDTH=300 HEIGHT=300
USEMAP="#map1"><BR>
[ <A HREF="contacts.html" ALT="Contacts">Contacts</A> ]
[ <A HREF="products.html" ALT="Products">Products</A> ]
[ <A HREF="new.html" ALT="New!">New!</A> ]
</DIV>

which gives us this map:

Theoretically you can reference a map definition that is in an external file, but several browsers have problems with that, so it's best to stick to putting maps and map definitions in the same page.

<IMG LOWSRC="..."> >