Changing up and down arrow with jquery
<p>Why won't this jQuery change my image to a down arrow like I want it to? When a user opens a drop down, the up arrow changes to a down arrow. I'm doing this with an if else because I don't know any easier way, but it's not working. The arrow stays up the entire time, no matter how many times I click. Here is the jQuery. Should be all thats needed. Thanks!</p>

<pre><code>    $("h3#mpcClients").click(function() {
            $("#hidden0").slideToggle(500); 

            var up = true;

            if (up == true) {

            $("td h3").css("background-image", "url(http://www.crm-newsletter.com/client-emails/images/arrowDown.png)");
            up=false;
          }
            else if(up == false) {
                $("td h3").css("background-image", "url(http://www.crm-newsletter.com/client-emails/images/arrowUp.png)");
            up=true;
            }
            });
</code></pre>
