function pruefen_reg(){
	var ret		= true;
	var error = document.getElementById("error");
	var html="";
	if(document.getElementById("benutzername").value==""){html += "- Benutzername<br>";ret=false;}
	if(document.getElementById("name").value==""){html += "- Name<br>";ret=false;}
	if(document.getElementById("passwort").value==""){html += "- Passwort<br>";ret=false;}
	if(document.getElementById("station").selectedIndex==-1){html += "- Stationen<br>";ret=false;}
	if(document.getElementById("email").value==""){html += "- email<br>";ret=false;}else{
		if(!EMail(document.getElementById("email").value)){html += "- email Adresse nciht korrekt<br>";ret=false;}
	}
	if(html!=""){html = "Folgende Felder müssen ausgefüllt sein:<br>"+html;}
	error.innerHTML = html;
	return ret;
}
function pruefen(){
	var sendbutton = document.getElementById("submiter");
	if( document.getElementById("mail").value != "" && document.getElementById("titel").value != "" && document.getElementById("artist").value != "" && EMail(document.getElementById("mail").value)){sendbutton.disabled = false;}else{sendbutton.disabled = true;}
	if(!EMail(document.getElementById("mail").value)){alert("Ihre e-mail Adresse ist ungültig");}
}
function EMail(s){
 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)
 }
 return(res);
}