// JavaScript Document


/*
  Funktionen zur Ueberpruefung der Mailadresse
  Copyright Lutz Eymers <ixtab@polzin.com>, 1997
  Polzin GmbH, Duesseldorf
*/


 function isDigit( ch )
  {
    if ( (ch >= '0') && (ch <= '9') )
      return true;
    else
      return false;
  }


  function isAlpha( ch )
  {
    if ( ((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z')) )
      return true;
    else
      return false;
  }


  function isAlnum( ch )
  {
    if ( isAlpha( ch ) || isDigit( ch ) )
      return true;
    else
      return false;
  }


  function notIn( str1, str2 )
  {
    var i = 0;
    var j = str2.length;
    for( ; i<j; i++ )
    {
      var str3 =  str2.charAt(i);
      if( str1.indexOf( str3 ) != -1 )
        return false;
    }
    return true;
  }


  function checkUsername( username, mustBeQuoted )
  {
    var i = 0;
    var j = username.length;
    if ( username.charAt(0) != '"' )
    {
      if ( (username.charAt(0) <  ' ') || (username.charAt(0) >  '~')
            || !notIn( mustBeQuoted, username.charAt(0) ) )
        return false;
      for( i=1; i<j; i++ )
      {
        if ( ( (username.charAt(i) < ' ') || (username.charAt(i) >  '~')
              || !notIn ( mustBeQuoted, username.charAt(i) ) )
             && ( username.charAt(i-1) != '\\' ) )
          return false;
      }
    }
    else
    {
      if ( username.charAt( j-1 ) != '"' )
        return false;
      for( i=1; i<j-1; i++ )
      {
        if ( ( (username.charAt(i) == '\n') || (username.charAt(i) == '\r')
              || (username.charAt(i) == '\"') )
            && (username.charAt(i-1) != '\\') )
          return false;
      }

    }
    return true;
  }


  function checkNr ( nr )
  {
    var i=0;
    var j=nr.length;

    if( j < 1 )
      return false;

    for( ; i<j; i++ )
      if( ( nr.charAt(i) < '0' ) || ( nr.charAt(i) > '9' ) )
        return false;

    return true;
  }


  function checkIpnr( ipnr )
  {
    var iL=0;
    var iC=0;
    var i=0;
    var sNr = "";

    for( ; i< ipnr.length; i++ )
    {
      if ( ipnr.charAt(i) == '.' )
      {
        if ( !iL || (iL> 3) || parseInt( sNr,10 ) > 255 )
          return false;
        iC++;
        iL = 0;
        sNr = "";
        continue;
      }
      if ( isDigit ( ipnr.charAt(i) ) )
      {
        iL++;
        sNr = sNr + ipnr.charAt(i);
        continue;
      }
      return false;
    }

    if ( parseInt( sNr,10 ) > 255 )
      return false;
    if ( ( (iC==3) && (iL>=1) && (iL<=3) ) || ( (iC==4) && (!iL) )  )
      return true;
    else
      return false;
  }


  function checkFqdn( fqdn )
  {
    var iL=0;
    var iC=0;
    var i=fqdn.length-1;

    if ( (fqdn.charAt(0) == '.') || (fqdn.charAt(0) == '-') )
      return false;
    if ( fqdn.charAt(i) == '.' )
      i=i-1;

    for( ; i>=0; i-- )
    {
      if ( fqdn.charAt(i) == '.' )
      {
        if ( iL < 2 && iC < 2 )
          return false;
        if ( fqdn.charAt(i-1) == '-' )
          return false;
        iC++;
        iL = 0;
        continue;
      }
      if ( isAlnum ( fqdn.charAt(i) ) )
      {
        iL++;
        continue;
      }
      if ( fqdn.charAt(i) == '-' )
      {
        if ( !iL )
          return false;
        iL++;
        continue;
      }
      return false;
    }

    if ( !iC || ( iL == 1 && iC < 2 ) || ( !iL && iC==1 ) ) {
      return false;
    }

    return true;

  }


  function checkHostname( hostname )
  {
    if ( hostname.charAt(0) == '[' )
    {
      if ( hostname.charAt(hostname.length-1) != ']' )
        return false;
      var ipnr = hostname.substring( 1, hostname.length -1 );
        return checkIpnr( ipnr );
    }

    if ( hostname.charAt(0) == '#' )
    {
      var nr = hostname.substring( 1, hostname.length );
        return checkNr( nr );
    }

    return checkFqdn( hostname );
  }


  function checkEmailAdr( 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 checkEmailAdr( address )
  {
    
    var username = "";
    var hostname = "";

    if ( address.length < 8 )
      return 'falsch';

    var seperate = address.lastIndexOf("@");
    if ( seperate == -1 )
      return 'falsch';

    username = address.substring(0, seperate );
    if ( ! checkUsername( username, "<>()[],;:@\" " ) )
      return 'falsch';

    hostname = address.substring(seperate+1, address.length );
    if ( ! checkHostname( hostname ) )
      return 'falsch';

    return 'richtig';
  }

function checkAnmeldung (the_form) {

	
	var meldung = '';

	
	if (the_form.elements['unterzeichnerin'].value == '') {meldung = meldung + 'Bitte geben Sie Ihren Namen an.' + '\n'}

	if (checkEmailAdr(the_form.elements['email'].value) == 'falsch') {meldung = meldung + 'Die E-Mail-Adresse ist nicht oder nicht korrekt angeben.' + '\n'}
    

	if (the_form.elements['plz'].value == '') {meldung = meldung + 'Bitte füllen sie das Feld Postleitzahl aus.' + '\n'}	
	
	if (the_form.elements['proell'].checked || the_form.elements['faymann'].checked) {} else {meldung = meldung + 'Bitte wählen Sie zumindest einen Adressaten aus.' + '\n'}	

	
	if (meldung == '') {} else {
		alert(meldung); 
		return false;
	}
	
}