<!-- rotate banner by weight,header
function banner(img_source,url,alt,chance) {
   this.img_source = img_source;
   this.url = url;
   this.alt = alt;
   this.chance = chance;
}
function display() {
   with (this) document.write("<A HREF=" + url + "><IMG SRC='" + img_source + "' WIDTH=400 HEIGHT=116 BORDER=0 ALT='" + alt + "'></A>");
}
banner.prototype.display = display;
banners = new Array();
banners[0] = new banner("../kungfu_blog/images/ad_water.jpg",
                        "http://www.tibetankungfu.net/RaleighCtr.htm target='_self'",
                        "Tai Chi and Kung Fu Training",
                        15);
banners[1] = new banner("../kungfu_blog/images/ad_hopgar_400.jpg",
                        "http://www.tibetankungfu.net/kungfu_blog/archives/hop-gar-book.html target='_self'",
                        "tibetan hop gar book",
                        25);
banners[2] = new banner("../kungfu_blog/images/ad_calm_creek.jpg",
                        "http://www.tibetankungfu.net/meditation.htm target='_self'",
                        "Practice Meditation Raleigh",
                        15);
banners[3] = new banner("../kungfu_blog/images/ad_paqua_beach.jpg",
                        "http://www.tibetankungfu.net/Pa_Qua.htm target='_self'",
                        "Practice Tai Chi",
                        20);
banners[4] = new banner("../kungfu_blog/images/ad_work_share.jpg",
                        "http://www.tibetankungfu.net/RaleighCtr.htm target='_self'",
                        "kungfu taichi training",
                        15);
banners[5] = new banner("../kungfu_blog/images/ad_private_meditation_400.jpg",
                        "http://www.tibetankungfu.net/meditation.htm target='_self'",
                        "Private Meditation Sessions",
                        25);
banners[6] = new banner("../kungfu_blog/images/ad_nature_trees.jpg",
                        "http://www.tibetankungfu.net/meditation.htm target='_self'",
                        "meditation lessons tai chi",
                        15);
banners[7] = new banner("../kungfu_blog/images/ad_taoist_organ_book.jpg",
                        "http://www.tibetankungfu.net/kungfu_blog/archives/taoist-organ-cleansing-meditation-book.html target='_self'",
                        "taoist organ cleansing book",
                        25);
banners[8] = new banner("../kungfu_blog/images/ad_chikung.jpg",
                        "http://www.tibetankungfu.net/kungfu_blog/archives/golden-dragon-chikung-conditioning-exercise-program.html target='_self'",
                        "Chi Kung Raleigh",
                        25);											
sum_of_all_chances = 0;
for (i = 0; i < banners.length; i++) {
   sum_of_all_chances += banners[i].chance;
}
function display_banner() {
   chance_limit = 0;
   randomly_selected_chance = Math.round((sum_of_all_chances - 1) * Math.random()) + 1;
   for (i = 0; i < banners.length; i++) {
      chance_limit += banners[i].chance;
      if (randomly_selected_chance <= chance_limit) {
         document.write("<A HREF=" + banners[i].url + "><IMG SRC='" + banners[i].img_source + "' WIDTH=400 HEIGHT=116 BORDER=0 ALT='" + banners[i].alt + "'></A>");
         return banners[i];
         break;
      }
   }
}
//-->
