y=0;
ad=new Array(y);
var bnum=new Number(Math.floor(99999999 * Math.random())+1);

//ad[y++]='<a href="http://www.astrolabio.net/adserver/adserver-alfa.cgi?' + bnum + '+N=URL" target="_blank" onMouseOver="window.status=\'<<< Click Aqui ! >>>\'; return true" onMouseout="window.status=\'\';return true;"><img border="0" src="http://www.astrolabio.net/adserver/adserver-alfa.cgi?' + bnum + '+N=IMG" alt="Haga Click Aqui !" width="468" height="60"></a>'

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ad[y++]='<a href="http://serve.eurogrand.com/promoRedirect?member=astrolabio&campaign=DEFAULT&channel=desdehomep&zone=583539294&lp=0"><img border=0 src="http://serve.eurogrand.com/promoLoadDisplay?member=astrolabio&campaign=DEFAULT&channel=desdehomep&zone=583539294&lp=0" width="728" height="90"></a>'

//ad[y++]='<a href="http://adv.europartners.com/es/index.php?estebanv"><img border=0 src="http://banner.casinotropez.com/cgi-bin/banner.cgi?id=N&member=estebanv&profile=ep1gggsp=es"/></a>'

x = Math.floor(Math.random()*(y));
document.write(ad[x]);