Готовое демо.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<title>123</title>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1251">
<style type="text/css">
div {background:pink;}
div div {background:silver; margin:2px 9px;}
</style>
<script type="text/javascript">
var uuu=0;
function f1(){
document.getElementById("mnb").innerHTML=uuu++;
};
function f2(){
};
</script>
</head>
<body>
<div onmouseout="f1();">
<div onmouseout="f2();">1</div>
<div onmouseout="f2();">2</div>
<div onmouseout="f2();">3</div>
<div onmouseout="f2();">4</div>
<div onmouseout="f2();">5</div>
<div onmouseout="f2();">6</div>
<div onmouseout="f2();">7</div>
<div onmouseout="f2();">8</div>
<div onmouseout="f2();">9</div>
</div>
<br>
<div id="mnb">0</div>
</body>
</html>