Tente assim: <html>
<head>
<title>banner rotativo</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
window.onload = function(){
var id = null;
resumeBanners();
}
function Banners(){
var MNews = new Array();
MNews[0]= '<A HREF="01.jpg" target="_blank"><IMG SRC="01.jpg" WIDTH=169 HEIGHT=355 BORDER=0 ALT="texto"></a>';
MNews[1]= '<A HREF="02.jpg" target="_blank"><IMG SRC="02.jpg" WIDTH=169 HEIGHT=355 BORDER=0 ALT="texto"></a>';
var Numero = Math.floor(Math.random()*2);
document.getElementById( 'banner' ).innerHTML = MNews[Numero];
}
function resumeBanners() {
id = setInterval(Banners, 1000);
}
function stopBanners() {
clearInterval(id);
}
</script>
</head>
<body bgcolor="#FFFFFF" topmargin=0 leftmargin=0 text="#000000">
<table width="169" border="0" cellspacing="0" cellpadding="0" height="355" bordercolor="#000000">
<tr>
<td>
<div id='banner' align="center" onmouseover="stopBanners()" onmouseout="resumeBanners()"></div>
</td>
</tr>
</table>
</body>
</html> Um abraço, tudo de bom.