Problem with Accordeons and Input fields when activating Plugins

I am not such a great coder, this is what I found inside functions.php:

add_shortcode('akkordeon', 'nr_shortcode_akkordeon');
function nr_shortcode_akkordeon ($aArguments, $sInnerContent, $sShortcode) {

    $aArguments = nr_digest_shortcode_arguments($aArguments);

    global $aAkkordeonBereiche;
    $aAkkordeonBereiche = array();
    $sInnerContent = nr_process_standard_content($sInnerContent);

    $sAkkordeonHtml = '';
    foreach ($aAkkordeonBereiche as $aBereich) {
        $sBereichHtml = '
            <div class="na_bereich">
                <h3 class="nas_head">' . $aBereich['aArguments']['ueberschrift'] . '</h3>
                <div class="nas_body standard_content">' . $aBereich['sInnerContent'] . '</div>
            </div>
        ';
        $sAkkordeonHtml .= $sBereichHtml;
    }

    global $iAkkordeonNr;
    $iAkkordeonNr = intval($iAkkordeonNr) + 1;
    $sID = 'nat_akkordeon_' . $iAkkordeonNr;

    $sScript = '
        <script type="text/javascript">
            //<[CDATA[

                (function () {

                    var oData = {};
                    oData.sNr = "' . $iAkkordeonNr . '";
                    oData.sID = "' . $sID . '";
                    oData.jAkkordeon = jQuery("#" + oData.sID);
                    oData.jAkkordeon.data("oAkkordeonData", oData);

                    oData.aSections = [];
                    var jSections = oData.jAkkordeon.find(".na_bereich");
                    for (var iS = 0; iS < jSections.length; iS ++) {
                        var oSection = {};
                        oSection.jSection = jSections.eq(iS);
                        oSection.jHead = oSection.jSection.find(".nas_head");
                        oSection.jBody = oSection.jSection.find(".nas_body");
                        oSection.bOpen = true;
                        oSection.open = function () {
                            this.jBody.show();
                            this.bOpen = true;
                        }
                        oSection.close = function () {
                            this.jBody.hide();
                            this.bOpen = false;
                        }
                        oSection.jHead.data("oSectionData", oSection);
                        oSection.jHead.click(function(){
                            var oSection = $(this).data("oSectionData");
                            if (oSection.bOpen) {
                                oSection.close();
                            } else {
                                oSection.open();
                            }
                        });
                        oSection.close();
                        oData.aSections.push(oSection);
                    }

                })();

            //]]>
        </script>
    ';

    $sAkkordeonHtml = '<section id="' . $sID . '" class="nat_akkordeon">' . $sAkkordeonHtml . '</section>' . $sScript;

    return $sAkkordeonHtml;

}

The theme was developed especially for this website, so is this what is causing the problems and how can I enqueue the script the right way?

Thanks!

Ok, I guess that would be best as well.

Thanks for your help!