var ads = 2;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % ads;
var width=200;
var height=130;
var protocol="http://www.";
var domainarray=new Array("muninetguide.com","muninetguide.com");
var altarray=new Array("MuniNet Guide","MuniNet Guide");
var imagelocation="advert/";
var imagearray=new Array("muninetad.gif","muninetad2.gif");
url=protocol+domainarray[ad];
alt=altarray[ad];
banner=imagelocation+imagearray[ad];
document.write('<center>');
document.write('<a href=\"' + url + '\" target=\"_blank\">');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br>');
document.write('</a><\/center>');