https://www.ludgeri-he.de/_assets/2eecfeb36e124e8bedc42b9f63402bf9/Scripts/mmc_guestbook-0.9.5.js?1753747824

1var mmcGuestbook = {
2		
3	validateForm: function( formNode ){
4		var formValid = true;
5		// iterate form fields
6		$( formNode ).find('.form-row .validate').each(function(){
7			$(this).closest('.form-row').removeClass('error');
8			var fieldValid = true;
9			if( $(this).hasClass('required') && ! $(this).val() ){
10				fieldValid = false;
11			}
12			if ( $(this).hasClass('email') && ! $(this).val().match(/^$|(\S+@\S+\.\S+)$/) ){
13				fieldValid = false;			
14			}
15			if( $(this).hasClass('mts') && ! mmcGuestbook.validateMathTest( formNode ) ){
16			  fieldValid = false;
17			}
18			if( !fieldValid ){
19				$(this).closest('.form-row').addClass('error');
20				if( formValid )
21					$(this).focus();
22				formValid = false;
23			}
24		});
25		// return validation result
26		return formValid;
27	},
28	
29	validateMathTest: function( formNode ){
30	  var $mts;
31	  if( ($mts = $(formNode).find('#mmcgbform-mts') ).length == 0 )
32	    return true; // no math test
33	  var s = $mts.val();
34    var l = $(formNode).find('#mmcgbform-mts-label').html();
35    var expr = l.substr(0, l.search('='));
36    var s2 = eval( expr ).toString();
37    return (s == s2);
38	}
39	
40}