// ** Utility functions ** //

function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  } 
}

function getFileName(){
	return location.href.substring(location.href.lastIndexOf('/')+1);
}

function getPath(){
	return location.href.substring(0, location.href.lastIndexOf('/')+1);
}

function getRootPath(){
	return location.href.substring(0, location.href.lastIndexOf('/')-2);
}


function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function switchlang(plang){
// redirect and set cookie
	document.location.replace(getRootPath() + plang + "/" + getFileName());
	createCookie('langpref', plang, 365);
};