actual='';

function selectContent(){
  var content=extractContent();
  loadContent(content);
}

function extractContent(){
  var url=document.URL;
  var index=url.lastIndexOf('?');
  var content='';
  if(index==-1) content='biography';
  else content=url.substring(index+1);
  return content;
}

function loadContent(content){
  actual=content;
  document.getElementById('content').innerHTML=document.getElementById(content).innerHTML;
}

function changeLanguage(page){
  document.location.href=page+'?'+actual;
}