JSFiddle - React, Tailwind, and code Playground

HTML

<p class="toggle">Show Panel <img src="http://t3.gstatic.com/images?q=tbn:4TZreCjs_a1eDM:http://www.venice.coe.int/images/plus.png"></p>
<div class="hidden">
Blah Blah Blah
</div>

CSS

.hidden {
    display: none;
}

JavaScript

/* $(".toggle").click(function(){
  $(".hidden").slideToggle("slow");
    $(this).find('img').attr('src',function(i,src){
        return (src.indexOf('plusSign.gif') != -1)? 'minusSign.gif' : 'plusSign.gif';
    })
}); */
  
    
    $(".toggle").click(function(){
  $(".hidden").slideToggle("slow");
        $(this).html(function(i,html) {
            if (html.indexOf('Show') != -1 ){
               html = html.replace('Show','Hide');
            } else {
               html = html.replace('Hide','Show');
            }
            return html;
        }).find('img').attr('src',function(i,src){
        return (src.indexOf('plus.png') != -1)? 'http://t1.gstatic.com/images?q=tbn:1PS9x2Ho4LHpaM:http://www.unesco.org/ulis/imag/minus.png' :'http://t3.gstatic.com/images?q=tbn:4TZreCjs_a1eDM:http://www.venice.coe.int/images/plus.png';
    });
});