function checkLogin(sprache) {
	var result = true;
	var name = new Array();
	var text = new Array();
	
	getTexte(sprache, 'login.js');	

  if (isEmpty('username') === true) {
  	text.push(texte['TEXT_INSERT_USERNAME']);
  	name.push('username');
  	result = false;
  }
  if (isEmpty('passwort') === true) {
  	text.push(texte['TEXT_INSERT_PASSWORD']);
  	name.push('passwort');
  	result = false;
  }
  if (result === false) {
  	alert(text[0]);	
  	document.getElementsByName(name[0])[0].focus();
  }
  return result;
}