function changeFile() {
    var element = document.getElementById('selectedFile');
    var fileName = document.getElementById('fileInput').value;
    var fileInputBox = document.getElementById('fileInputBox');
    var ext = fileName.substr(fileName.lastIndexOf('.') + 1, 4);
    var filteredName = fileName.substr(fileName.lastIndexOf('/') + 1);
    filteredName = fileName.substr(fileName.lastIndexOf('\\') + 1);
    if (filteredName.length > 30)
      filteredName = filteredName.substr(0, 45) + ' ...'; 
    element.innerHTML = filteredName;
  }