Event.observe(window,"load",function(){var A="";if(null==(A=Cookie.get("bg"))){A=BGs[$random(0,BGs.length-1)];Cookie.set("bg",A,0)}$E("body").setStyle({backgroundImage:"url("+A+")"})});function clearbg(){Cookie.erase("bg");if(null!=Cookie.get("bg")){alert("remove failed")}};