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);
}


function check_kontakt()
{
 var message = "";
 
 if(document.kontakt.k_name.value == "") 
   message = "Bitte Namen angeben!\n";
 
 if(document.kontakt.k_email.value == "") 
   message = message + "Bitte E-Mail Adresse angeben!\n";
 else 
   if(!EMail(document.kontakt.k_email.value) && document.kontakt.k_email.value != "")
    message = message + "Bitte eine gültige E-mail Adresse eingegeben!\n"; 
   
 if(document.kontakt.k_text.value == "")
    message = message + "Bitte das Feld Nachrichten ausfüllen!\n";
 
 if(document.kontakt.k_sicherheitscode.value == "")
    message = message + "Bitte den Sicherheitscode berechnen!";
   
 if(message != "")
 {
     alert(message);
 }
    
 if(message == "")
   document.kontakt.submit();  
}


function check_contact()
{
 var message = "";
 
 if(document.kontakt.k_name.value == "") 
   message = "Please fill up name!\n";
 
 if(document.kontakt.k_email.value == "") 
   message = message + "Please fill up email-address!\n";
 else 
   if(!EMail(document.kontakt.k_email.value) && document.kontakt.k_email.value != "")
    message = message + "Please fill up a valid email-address!!\n"; 
   
 if(document.kontakt.k_text.value == "")
    message = message + "Please fill up the message field!!\n";
 
 if(document.kontakt.k_sicherheitscode.value == "")
    message = message + "Please fill up security code!!";
   
 if(message != "")
 {
     alert(message);
 }
    
 if(message == "")
   document.kontakt.submit();  
}

function check_gb()
{
 var message = "";
 
 if(document.gb.user_name.value == "") 
   message = "Bitte Namen angeben!\n";
 
 if(document.gb.user_mail.value == "") 
   message = message + "Bitte E-Mail Adresse angeben!\n";
 else 
   if(!EMail(document.gb.user_mail.value) && document.gb.user_mail.value != "")
    message = message + "Bitte eine gültige E-mail Adresse eingegeben!\n"; 
   
 if(document.gb.user_gb.value == "")
    message = message + "Bitte das Feld Nachrichten ausfüllen!\n";
 
 if(document.gb.sicherheitscode.value == "")
    message = message + "Bitte den Sicherheitscode berechnen!";
   
 if(message != "")
 {
     alert(message);
 }
    
 if(message == "")
   document.gb.submit();  
}

function check_gb_englisch()
{
 var message = "";
 
 if(document.gb.user_name.value == "") 
   message = "Please fill up name!\n";
 
 if(document.gb.user_mail.value == "") 
   message = message + "Please fill up email-address!\n";
 else 
   if(!EMail(document.gb.user_mail.value) && document.gb.user_mail.value != "")
    message = message + "Please fill up a valid email-address!!\n"; 
   
 if(document.gb.user_gb.value == "")
    message = message + "Please fill up the message field!!\n";
 
 if(document.gb.sicherheitscode.value == "")
    message = message + "Please fill up security code!!";
   
 if(message != "")
 {
     alert(message);
 }
    
 if(message == "")
   document.gb.submit();  
}