Bannerrotatation ???

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<script language="JavaScript" type="text/javascript">
bannerSource = new Array();
bannerUrl = new Array();
bannerAlt = new Array();
bannerTitle = new Array();

// Webbanner 1
bannerSource[0] = 'banner1.gif';
bannerTitle[0]  = 'Webbanner 1';
bannerAlt[0]    = 'Webbanner 1';
bannerUrl[0]    = 'http://www.domain1.de';

// Webbanner 2
bannerSource[1] = 'banner2.gif';
bannerTitle[1]  = 'Webbanner 2';
bannerAlt[1]    = 'Webbanner 2';
bannerUrl[1]    = 'http://www.domain2.de';

// Webbanner 3
bannerSource[2] = 'banner3.gif';
bannerTitle[2]  = 'Webbanner 3';
bannerAlt[2]    = 'Webbanner 3';
bannerUrl[2]    = 'http://www.domain3.de';

function BannerRotation() {
    var nr = Math.round(((bannerSource.length - 1) * Math.random()));
    return '<a href="' + bannerUrl[nr] + '" target="_blank"><img src="' + bannerSource[nr] + '" height="60" width="468" border="0" alt="' + bannerAlt[nr] + '" title="' + bannerTitle[nr] + '"></a>';
}
</script>

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<script language="javascript" type="text/javascript">document.write(BannerRotation());</script>