// JavaScript Document
function chanageob(v){
  //v=$F(id);
  url=window.location+"";
  if(url.indexOf("?")!=-1){
	if(url.indexOf("ob=")!=-1){
        reg=/ob=([1-2]){0,4}/
        url=url.replace(reg,"ob="+v);
	    window.location.href=url;
	}else{
		window.location.href=window.location+"&ob="+v;
	}
  }else{
    window.location.href=window.location+"?ob="+v;
  }
}