c'è un errore in quello che hai scritto:


<body bgcolor="#F0F8FF" text="#000000" topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0">
<div align="center">
<div id="lagondola" style="position:relative; width:250px; height:136px; z-index:201; background-color: #FFFFFF; layer-background-color: #FFFFFF; border: 1px none #000000; visibility: hidden">


hfgfgfgffffffffffffffffff</p>


ffffffffffffffffffffffffffffffff</p>


fffffffffffffffffffffffffffffff</p>


ffffffffffffffffffffffffffff</p>
</div>
<div align="center">[img]nuoveimmagini/definitive/pagina.jpg[/img]
<map name="Map">
<area shape="rect" coords="70,31,182,145" a href="#" onMouseOver="MM_showHideLayers('lagondola','','sho w')" onMouseOut="MM_showHideLayers('lagondola','','hide ')">
</map>
</div>
</div>
</body>


non hai chiuso il primo div (align-center)