function page_checkForm(formID, langID)
{
	if(langID == null)
		langID = 'de';
		
	var ERRCODE = new Array();
		ERRCODE['de'] = new Object();
		ERRCODE['de']['single'] = 'Das markierte Feld (%1) <br />beinhaltet keine oder eine fehlerhafte Eingabe.';
		ERRCODE['de']['multiple'] = 'Die markierten Felder (%1) <br />beinhalten keine oder fehlerhafte Eingaben.';

		ERRCODE['en'] = new Object();
		ERRCODE['en']['single'] = 'The highlighted field (%1) <br />has not been completed or contains an incorrect entry.';
		ERRCODE['en']['multiple'] = 'The highlighted fields (%1) <br />have not been completed or contain incorrect entries';

		ERRCODE['fr'] = new Object();
		ERRCODE['fr']['single'] = 'Le champ sélectionné (%1) <br />ne comprend pas ou entrées incorrectes.';
		ERRCODE['fr']['multiple'] = 'Les champs marqués (%1) <br />ne comprennent pas ou entrées erronées.';

	var necessary = $('#' + formID + ' input[name=necessary]').val();
       
    var temp = new Array();
    var ok = true;
    var formularerror = '';
    var errorfields = new Array();
    
    temp = necessary.split(';');
	var i = 0;
		
    for (var n = 0; n < temp.length; n++)
    { 
        // Fehlermedungen entfernen
        $('#form-error-' + n).remove(); 
            
        if(temp[n] == 'Ihre E-Mail')
        {
            if(!emailCheck($('#' + formID + ' [name=' + temp[n] + ']').val()))
            {
        	   ok = false;
        	   errorfields[i++] = temp[n];
            }
        }
        else
        {
            if($('#' + formID + ' [name=' + temp[n] + ']').val() == '')
            {
                ok = false;
           	    errorfields[i++] = temp[n];
            }
        }
        
	}

    if(ok)
        return true;
	else
	{
        for (var m = 0; m < errorfields.length; m++)
        {
            var pos = $('#' + formID + ' [name=' + errorfields[m] + ']').offset();   
            var eImg = document.createElement('img');
            eImg.setAttribute('id', 'form-error-' + m);
            eImg.setAttribute('src', 'fileadmin/templates/image/error.gif');
            eImg.setAttribute('alt', 'Error');
            eImg.style.position = 'absolute';
            eImg.style.top = Math.round(pos.top - 7) + 'px';
            eImg.style.left = Math.round(pos.left + $('#' + formID + ' [name=' + errorfields[m] + ']').outerWidth() - 5) + 'px';
            document.body.appendChild(eImg);  
        }
       
		var error = '';
		for (var j = 0; j < errorfields.length; j++)
    	{	
    		error += errorfields[j];
    		if(j < (errorfields.length-1))
    			error += ', ';
    	}
    	if(errorfields.length > 1)
    		formularerror = ERRCODE[langID]['multiple'];    
    	else
    		formularerror = ERRCODE[langID]['single'];		
    		
    	$('#page_form_error').attr('innerHTML', formularerror.replace('%1', error));
        $('#page_form_error').show();
        
        return false;
    }
}

function emailCheck (emailStr) 
{
    /* The following variable tells the rest of the function whether or not
    to verify that the address ends in a two-letter country or well-known
    TLD.  1 means check it, 0 means don't. */
    
    var checkTLD=1;
    
    /* The following is the list of known TLDs that an e-mail address must end with. */
    
    var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
    
    /* The following pattern is used to check if the entered e-mail address
    fits the user@domain format.  It also is used to separate the username
    from the domain. */
    
    var emailPat=/^(.+)@(.+)$/;
    
    /* The following string represents the pattern for matching all special
    characters.  We don't want to allow special characters in the address. 
    These characters include ( ) < > @ , ; : \ " . [ ] */
    
    var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
    
    /* The following string represents the range of characters allowed in a 
    username or domainname.  It really states which chars aren't allowed.*/
    
    var validChars="\[^\\s" + specialChars + "\]";
    
    /* The following pattern applies if the "user" is a quoted string (in
    which case, there are no rules about which characters are allowed
    and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
    is a legal e-mail address. */
    
    var quotedUser="(\"[^\"]*\")";
    
    /* The following pattern applies for domains that are IP addresses,
    rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
    e-mail address. NOTE: The square brackets are required. */
    
    var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
    
    /* The following string represents an atom (basically a series of non-special characters.) */
    
    var atom=validChars + '+';
    
    /* The following string represents one word in the typical username.
    For example, in john.doe@somewhere.com, john and doe are words.
    Basically, a word is either an atom or quoted string. */
    
    var word="(" + atom + "|" + quotedUser + ")";
    
    // The following pattern describes the structure of the user
    
    var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
    
    /* The following pattern describes the structure of a normal symbolic
    domain, as opposed to ipDomainPat, shown above. */
    
    var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
    
    /* Finally, let's start trying to figure out if the supplied address is valid. */
    
    /* Begin with the coarse pattern to simply break up user@domain into
    different pieces that are easy to analyze. */
    
    var matchArray=emailStr.match(emailPat);
    
    if (matchArray==null) {
    
    /* Too many/few @'s or something; basically, this address doesn't
    even fit the general mould of a valid e-mail address. */
    
    //alert("Email address seems incorrect (check @ and .'s)");
    return false;
    }
    var user=matchArray[1];
    var domain=matchArray[2];
    
    // Start by checking that only basic ASCII characters are in the strings (0-127).
    
    for (i=0; i<user.length; i++) {
    if (user.charCodeAt(i)>127) {
    //alert("Ths username contains invalid characters.");
    return false;
       }
    }
    for (i=0; i<domain.length; i++) {
    if (domain.charCodeAt(i)>127) {
    //alert("Ths domain name contains invalid characters.");
    return false;
       }
    }
    
    // See if "user" is valid 
    
    if (user.match(userPat)==null) {
    
    // user is not valid
    
    //alert("The username doesn't seem to be valid.");
    return false;
    }
    
    /* if the e-mail address is at an IP address (as opposed to a symbolic
    host name) make sure the IP address is valid. */
    
    var IPArray=domain.match(ipDomainPat);
    if (IPArray!=null) {
    
    // this is an IP address
    
    for (var i=1;i<=4;i++) {
    if (IPArray[i]>255) {
    //alert("Destination IP address is invalid!");
    return false;
       }
    }
    return true;
    }
    
    // Domain is symbolic name.  Check if it's valid.
     
    var atomPat=new RegExp("^" + atom + "$");
    var domArr=domain.split(".");
    var len=domArr.length;
    for (i=0;i<len;i++) {
    if (domArr[i].search(atomPat)==-1) {
    //alert("The domain name does not seem to be valid.");
    return false;
       }
    }
    
    /* domain name seems valid, but now make sure that it ends in a
    known top-level domain (like com, edu, gov) or a two-letter word,
    representing country (uk, nl), and that there's a hostname preceding 
    the domain or country. */
    
    if (checkTLD && domArr[domArr.length-1].length!=2 && 
    domArr[domArr.length-1].search(knownDomsPat)==-1) {
    //alert("The address must end in a well-known domain or two letter " + "country.");
    return false;
    }
    
    // Make sure there's a host name preceding the domain.
    
    if (len<2) {
    //alert("This address is missing a hostname!");
    return false;
    }
    
    // If we've gotten this far, everything's valid!
    return true;
}