var imageList = new Array;
imageList[0] = "banner_en_2.gif";
imageList[1] = "GnuCash.jpg";
imageList[2] = "gnubanner.jpg";
imageList[3] = "468x60FF2_Orange.png";
var urlList = new Array;
urlList[0] = "http://www.nosoftwarepatents.com";
urlList[1] = "http://www.gnucash.org";
urlList[2] = "http://www.gnu.org/";
urlList[3] = "http://www.spreadfirefox.com/?q=affiliates&id=176572&t=216";

var imageChoice = Math.floor(Math.random() * imageList.length);
document.write('<a href="' + urlList[imageChoice] +
'" TARGET="_blank"><img src="/images/' + 
imageList[imageChoice] + '"></a>');