function showBanner() {
   var x=(Math.round(Math.random()*10000))%bannertext.length;
   document.write(bannertext[x]);
}

// you can add as many banner html lines as you wish here.
// each one should start and end with double quotes BUT contain no double quotes.
// all but the last line should be followed by a comma.
bannertext = new Array(
"<ul class=header-images><li><img src=http://www.bomasf.org/images/img-1.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/img-2.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/img-3.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/img-4.jpg width=207 height=95 alt= /></li></ul>",
"<ul class=header-images><li><img src=http://www.bomasf.org/images/topimg_1.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_5.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_10.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_8.jpg width=207 height=95 alt= /></li></ul>",
"<ul class=header-images><li><img src=http://www.bomasf.org/images/topimg_4.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_9.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_5.jpg width=207 height=95 alt= /></li><li><img src=http://www.bomasf.org/images/topimg_1.jpg width=207 height=95 alt= /></li></ul>"
);