function loadContent(file){
  var scriptTag = document.getElementById('loadScript');
  var head = document.getElementsByTagName('head').item(0)
  if(scriptTag) head.removeChild(scriptTag);
  script = document.createElement('script');
  script.src = file;
	script.type = 'text/javascript';
	script.id = 'loadScript';
	head.appendChild(script)
}