adBanners = new Array("/images/banners/pokerbility.gif",
                     "/images/banners/slippedstream.gif",
                     "/images/banners/webfaction1.png",
                     "/images/banners/webfaction2.png"
                      );

adURLs = new Array("/poker_tutor.shtml",               
                   "/python/slippedstream.shtml",
                   "http://www.webfaction.com/?affiliate=fuzzyman",
                   "http://www.webfaction.com/?affiliate=fuzzyman"     
                   );

adALT = new Array("Your Realtime Poker Assistant",
                  "SlippedStream - Free Sky TV in Your PC",
                  "Hosting for an Agile Web",
                  "Webfaction: With One Click Installer"
                 );

var randomnumber = Math.random();
var numpics = adBanners.length - 1;
var thisIndex = Math.round( numpics * randomnumber);

var thisImage = adBanners[thisIndex];
var thisURL = adURLs[thisIndex];
var thisALT = adALT[thisIndex];

var imgLink = '<a href="' + thisURL + '"><img src="' + thisImage + '" width="468" height="60" alt="' + thisALT + '" title="' + thisALT + '" /></a>';
document.getElementById("voidspace_banner").innerHTML = imgLink;