$(document).ready(function(){
  var location = window.location;
  var url;
  if (location.toString().startsWith("http://ifs")) {
    url = "http://ifs.tuwien.ac.at/imp/header.shtml";
  } else {
    url = "http://www.ifs.tuwien.ac.at/imp/header.shtml";
  }
  $.get(url, prependHeader);
});


function prependHeader(data) {
  if (document.getElementById('header') == null) {
    $('.container').prepend(data);
  }
}

String.prototype.startsWith = function(str){
    return (this.indexOf(str) === 0);
}