come ti avevo detto, sull'evento onmouseover del tag area:
codice:
<AREA shape=POLY 
  coords=116,115,117,122,123,131,127,139,127,153,134,163,132,176,138,177,141,183,151,190,152,199,165,194,172,182,175,173,174,168,182,163,178,159,183,146,171,142,166,133,161,128,150,133,138,129,124,123 
  href="http://www.agriturismo-italiano.com/agriturismo-toscana.php" target="_top" title="Agriturismi in Toscana" 
  onmouseover="MM_swapImage('cartina','','../images/agriturismo-italiano/toscana.gif',1)" 
  onmouseout=MM_swapImgRestore()>
HTH
Zappa