var currurl = location.href;
var load_ext = currurl.substring(currurl.length - 7,currurl.length-5);
$(document).ready( function() {
  $("#choose_language").val(load_ext);
  $("#choose_language option:contains(sp)").attr("selected", true);
  $('#choose_language').change( function() {
      var ext = $('#choose_language').val();  
      var currpath = location.href;
      var redirectpath = currpath.substring(0, currpath.length - 7) + ext + ".html";
      window.location=redirectpath;
  });
});