// Javascript

$(document).ready(function(){
  $('.flag')
   .click(function(){
     window.location = $(this).attr('id')+'.php';
   })
   .each(function(){
    var temp = window.location + '';
    if(temp.indexOf($(this).attr('id')) != -1 || (temp[temp.length-1] == '/' && $(this).attr('id') == 'index')){
     $(this).addClass('selected');
    }
   });
 });