var imagenumber = 9 ; //Anzahl der Grafiken
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;

anzeige = new Array

anzeige[1]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=1300&type=b34&bnb=34" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?ref=5503&site=1300&b=34" '
            + 'alt="Abebooks.de - Neue und gebrauchte Bücher" width="234" height="60" border="0"></a>'

anzeige[2]  = '<a href="http://www.profiseller.de/shop1/mega/index.php3?ps_id=P5367915&shop=10&banner=1014" target="_blank">'
            + '<img src="http://www.profiseller.de/banner/banner.php3?ps_id=P5367915&banner=1014" '
            + 'alt="1&amp;1 Internet.DSL" width="234" height="60" border="0"></a>'

anzeige[3]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=3175&type=b6&bnb=6" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?site=3175&ref=5503&b=6" '
            + 'alt="Auktionsideen" width="234" height="60" border="0"></a>'

anzeige[4]  = '<A HREF="http://partners.webmasterplan.com/click.asp?ref=5503&site=2480&type=b34&bnb=34" TARGET="_blank">'
            + '<IMG SRC="http://banners.webmasterplan.com/view.asp?site=2480&ref=5503&b=34" '
            + 'BORDER="0" ALT="OBI Bau- und Heimwerkermarkt" width="234" height="60"></A>'

anzeige[5]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=1879&type=b2&bnb=2" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?site=1879&ref=5503&b=2" '
            + 'alt="Tchibo.de - Jede Woche eine neue Welt!" width="234" height="60" border="0"></a>'

anzeige[6]  = '<a href="http://www.zanox-affiliate.de/ppc/?537448C1322079158T" target="_blank">'
            + '<img src="http://www.zanox-affiliate.de/ppv/?537448C1322079158" '
            + 'alt="shopping" width="234" height="60" border="0"></a>'

anzeige[7]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=2894&type=b3&bnb=3" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?site=2894&ref=5503&b=3" '
            + 'alt="Surf&amp;Rail-Neukunden" width="234" height="60" border="0"></a>'

anzeige[8]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=3657&type=b107&bnb=107" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?ref=5503&site=3657&b=107" '
            + 'alt="Alles rund um Technik und Multimedia finden Sie bei QUELLE" width="234" height="60" border="0"></a>'

anzeige[9]  = '<a href="http://partners.webmasterplan.com/click.asp?ref=5503&site=1879&type=b75&bnb=75" target="_blank">'
            + '<img src="http://banners.webmasterplan.com/view.asp?ref=5503&site=1879&b=75" '
            + 'alt="Tchibo.de - Jede Woche eine neue Welt!" width="234" height="60" border="0"></a>'

var einblendung = anzeige[rand1];

document.write(einblendung);