var s_url = location.href;

if(s_url.substr(0,8)=='https://' || s_url.indexOf('://www.') != -1) {
  s_url = s_url.replace('://www.','://')
  s_url = s_url.replace('https://','http://')
  //alert(s_url);
  location.href = s_url;
}