function checkEmail( address ) {
      var status = true;
      var username = "";
      var hostname = "";
  
      if ( address.length < 8 )
        return false;
  
      var seperate = address.lastIndexOf("@");
      if ( seperate == -1 )
        return false;
  
      username = address.substring(0, seperate );
      if ( ! checkUsername( username, "<>()[],;:@\" " ) )
        return false;
  
      hostname = address.substring(seperate+1, address.length );
      if ( ! checkHostname( hostname ) )
        return false;
  
      return true;
    }
    
    
    function checkNlEmailAdress( name ) {
      if(name == "" || !name) name="email";
      if( checkEmail(document.getElementById(name).value) == false ) {     
        alert("Bitte geben Sie eine korrekte E-Mail-Adresse ein.");
        return false;
        
      }
      return true;
    }