diff --git a/.gitignore b/.gitignore
index e4b8749..adfa11c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *.tmproj
 nbproject
 .ftpssh_settings
+.idea
diff --git a/js/jquery.formbuilder.js b/js/jquery.formbuilder.js
index 57368b7..8236061 100644
--- a/js/jquery.formbuilder.js
+++ b/js/jquery.formbuilder.js
@@ -426,7 +426,7 @@
 					serialStr += opts.prepend + '[' + li_count + '][' + key + ']=' + encodeURIComponent($(this).attr(opts.attributes[att]));
 					// append the form field values
 					if (opts.attributes[att] === 'class') {
-						serialStr += opts.prepend + '[' + li_count + '][required]=' + encodeURIComponent($('#' + $(this).attr('id') + ' input.required').attr('checked'));
+						serialStr += opts.prepend + '[' + li_count + '][required]=' + encodeURIComponent($('#' + $(this).attr('id') + ' input.required').is(':checked'));
 						switch ($(this).attr(opts.attributes[att])) {
 						case 'input_text':
 							serialStr += opts.prepend + '[' + li_count + '][values]=' + encodeURIComponent($('#' + $(this).attr('id') + ' input[type=text]').val());
@@ -442,7 +442,7 @@
 								}
 								else {
 									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][value]=' + encodeURIComponent($(this).val());
-									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().attr('checked');
+									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().is(':checked');
 								}
 								c++;
 							});
@@ -455,21 +455,21 @@
 								}
 								else {
 									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][value]=' + encodeURIComponent($(this).val());
-									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().attr('checked');
+									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().is(':checked');
 								}
 								c++;
 							});
 							break;
 						case 'select':
 							c = 1;
-							serialStr += opts.prepend + '[' + li_count + '][multiple]=' + $('#' + $(this).attr('id') + ' input[name=multiple]').attr('checked');
+							serialStr += opts.prepend + '[' + li_count + '][multiple]=' + $('#' + $(this).attr('id') + ' input[name=multiple]').is(':checked');
 							$('#' + $(this).attr('id') + ' input[type=text]').each(function () {
 								if ($(this).attr('name') === 'title') {
 									serialStr += opts.prepend + '[' + li_count + '][title]=' + encodeURIComponent($(this).val());
 								}
 								else {
 									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][value]=' + encodeURIComponent($(this).val());
-									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().attr('checked');
+									serialStr += opts.prepend + '[' + li_count + '][values][' + c + '][baseline]=' + $(this).prev().is(':checked');
 								}
 								c++;
 							});