Вот код:
<html>
<head>
<script language="JavaScript" type="text/javascript">
var textDiv = document.getElementById('out');
function setText(_text){
textDiv.innerHTML = _text;
}
</script>
</head>
<body>
<img src="1_2_18.jpg" usemap="#map">
<div id="out">Out!!!</div>
<map name="map">
<area coords="0,0,392, 424" href="#1" shape="rect" onmouseover = function() {setText('ваш текст')}; onmouseout = function() {setText('')};>
<area coords="0,392, 392, 748" href="#2" shape="rect" onmouseover = function() {setText('ваш текст')}; onmouseout = function() {setText('')};>
</map>
</body>
</html>