// Einblenden
	function start() {

  	if (document.getElementById('content-index')) {

  		document.getElementById('content-index').style.visibility = 'visible';
  		document.getElementById('content-index').style.display = 'none';
  		Effect.Appear ('content-index');
  	}

  	if (document.getElementById('content-text')) {

  		document.getElementById('content-text').style.visibility = 'visible';
  		document.getElementById('content-text').style.display = 'none';
  		Effect.Appear ('content-text');
  	}

  	if (document.getElementById('content-images')) {

  		document.getElementById('content-images').style.visibility = 'visible';
  		document.getElementById('content-images').style.display = 'none';
  		Effect.Appear ('content-images');
  	}

  	return false;
  }


  // Email
  function check (lang) {

		if (document.formular.Name.value == '') {

			if (lang == 'de')
				alert ('Bitte den Namen angeben!');
			else
				alert ('Please fill in your name!');

			document.formular.Name.focus();
			return false;
		}
		
		if (document.formular.eMail.value == '') {

			if (lang == 'de')
				alert ('Bitte die e-Mail-Adresse angeben!');
			else
				alert ('Please fill in your e-Mail address!');

			document.formular.eMail.focus();
			return false;
		}
		
		if (document.formular.eMail.value != '') {

			s = document.formular.eMail.value;

			var a = false;
			var res = false;

			if (typeof(RegExp) == 'function') {

				var b = new RegExp('abc');
				if(b.test('abc') == true) {
					a = true;
				}
			}

			if (a == true) {

				reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
			           '(\\@)([a-zA-Z0-9\\-]+)'+
			           '(\\.)([a-zA-Z]{2,4})$');
				res = (reg.test(s));
			}
			else	{

				res = (s.search('@') >= 1 &&
				s.lastIndexOf('.') > s.search('@') &&
				s.lastIndexOf('.') >= s.length - 5)
			}

			if (res == false) {

				if (lang == 'de') {
					alert ("Bitte eine korrekte e-Mail-Adresse angeben!");
				}
				else {
					alert ("Please fill in a valid e-Mail address!");
				}

				document.formular.eMail.focus();
				return false;
			}
		}
		
		if (document.formular.Nachricht.value == '') {

			if (lang == 'de')
				alert ('Bitte eine Nachricht angeben!');
			else
				alert ('Please fill in a message!');

			document.formular.Nachricht.focus();
			return false;
		}
		
		return true;
	}