JSFiddle - React, Tailwind, and code Playground

HTML

<div class="adwizard">
    <select id="selectdrop" name="selectdrop" class="adwizard-bullet">
        <option value="adwizard">AdWizard</option>
        <option value="collateral">Collateral Ordering Tool</option>
        <option value="ebrochure" selected="selected">eBrochures</option>
        <option value="brand">Brand Center</option>
        <option value="funtees">FunTees</option>
    </select>
</div>

<div class="panels">   
    <div id="adwizard" class="sub-box showhide">
        <img src="../images/bookccl/img-adwizard.gif" width="95" height="24" alt="AdWizard" />
        <p>Let Carnival help you grow your business with our great tools! Lor ipsum dolor sit amet. <a href="https://www.carnivaladwizard.com/home.asp">Learn More</a></p>
    </div>
    
    <div id="collateral" class="sub-box showhide">
        <p>The Collateral Ordering Tool makes it easy for you to order destination brochures and the sales DVD for that upcoming event. <a href="http://carnival.litorders.com/workplace.asp">Learn More</a></p>
    </div>
    
    <div id="ebrochure" class="sub-box showhide">
        <img src="../images/bookccl/img-ebrochure.gif" width="164" height="39" alt="Brochures" />
        <p>Show your clients that you're listening to their specific vacation needs by delivering relevant planning info quickly.  <a href="http://productiontrade.carnivalbrochures.com/start.aspx">Learn More</a></p>
    </div>
    
    <div id="brand" class="sub-box showhide">
        <p>Carnival Brand Center is where you'll find information on our strategy, guidlines, templates and artwork.   <a href="https://carnival.monigle2.net/user_info.asp?login_type=agent">Learn More</a></p>
    </div>
    
    <div id="funtees" class="sub-box showhide">
        <img src="../images/bookccl/img-funtees.gif" width="164" height="39" alt="Funtees" />
        <p>Create your very own Fun Design shirts to commemorate that special occasion aboard a Carnival "Fun Ship!"  <a...

CSS

.showhide
{
    display: none;
}

JavaScript

$(function() {
    var $selectdrop = $('#selectdrop');
    $selectdrop.change(function() {
        $('.panels>div').hide();
        $('#' + $selectdrop.val()).show();
    }).trigger('change');
});