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>'

//ad[y++]='<a href="http://www.astrolabio.net/contactos/" target="_blank" onMouseOver="window.status=\'<<< Click Aqui ! >>>\'; return true" onMouseout="window.status=\'\';return true;"><img border=0 width="468" height="60" src="http://www.astrolabio.net/banners/468x60/alto/lujan.gif"></a>'

ad[y++]='<SCRIPT TYPE="text/javascript" SRC="http://ad.yieldmanager.com/imp?z=4&s=2620"></SCRIPT>'

//ad[y++]='<a href="http://www.astrolabio.net/contactos/" target="_blank" onMouseOver="window.status=\'<<< Click Aqui ! >>>\'; return true" onMouseout="window.status=\'\';return true;"><img border=0 width="468" height="60" src="http://www.astrolabio.net/banners/468x60/alto/rusa.gif"></a>'

//ad[y++]='<a href="http://servedby.advertising.com/click/site=690360/bnum=73166432" target="_blank" onMouseOver="window.status=\'<<< Click Aqui ! >>>\'; return true" onMouseout="window.status=\'\';return true;"><img border=0 width="468" height="60" src="http://servedby.advertising.com/site=690360/size=468060/bnum=73166432/bins=1/rich=0" alt="Click Aqui"></a>'

//ad[y++]='<iframe width=468 height=60 scrolling=no frameborder=0 marginheight=0 noresize marginwidth=0 src="http://www.astrolabio.net/bannerserver/468x60-hispano.html" target=_blank></iframe>'

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