<SCRIPT>
gfx0="http://www.image_host.com/image.gif";
lnk0="http://www.websiteURL.com";
alt0="Name of website";
txt0="www.websiteURL.com";

gfx1="http://www.image_host.com/image.gif";
lnk1="http://www.websiteURL.com";
alt1="Name of website";
txt1="www.websiteURL.com";

len=2; 
today=new Date();
today=today.getTime()/1;
rnd=today%len;
document.writeln('<A HREF="'+eval("lnk"+rnd)+'"><IMG SRC="'+eval("gfx"+rnd)+'" ALT="'+eval("alt"+rnd)+'"><BR>'+eval("txt"+rnd)+'</A>');
</SCRIPT>