function list(pers) {
	// Email
	var message = "";
	var mail = pers;
	if (mail.length < 1){
		message += "diese adresse ist ungültig.\n";
	}
	if (mail.length > 1){
		mail2 = mail.split("@");
		mail3 = mail.split(".");
		if (mail2.length != 2 || mail3.length < 2 || mail2[0] == "" || mail2[1] == "" || mail3[0] == "" || mail3[1] == "" || mail.indexOf(" ") != -1){
			message += "diese adresse ist ungültig.\n";
		}
	}
	
	// Action
	if (message == ""){
		var y=(screen.height-250)/2;
		var x=(screen.width-400)/2;
		window.open("/de/mailinglist.php?pers="+pers,"list","width=220,height=250,left="+x+",top="+y+",toolbar=0,scrollbars=no");
	}else{
		alert(message);
	}
	
	
}