How to change only a certain character using jquery

Using jquery: How to change only a certain character using jquery on newest questions tagged jquery – Stack Overflow

I need to change the + to – when toggled. The code is set up at
http://jsfiddle.net/B65Ht/

HTML

<a class="expandB" href="#">
   <h3>Advocacy + </h3>
</a>
<div class="content">
    Content goes here
</div>

jQuery

$(document).ready(function(){
    $('.content').hide();
    $("a.expandB").click(function() {
        $(this).toggleClass("expandB").next().slideToggle("slow", function(){

       // script to toggle between + and -
     });

return false; //Prevent the browser jump to the link anchor/Prevent the browser jump to the link anchor
});

});​

​

source: http://stackoverflow.com/questions/11365064/how-to-change-only-a-certain-character-using-jquery
Using jquery: using-jquery