Reaching variables in jQuery

I have a code like this :

<script type="text/javascript">
    var currentPicture;//default picture
    var picEL;//the image viewer element
    jQuery("#backImageShower").hover(
        function(i)
        {
            picEL = jQuery("#dynloadarxdock > img");
            currentPicture = picEL.attr("src");
       开发者_如何学Go     picEl.attr("src","back.jpg");
        },
        function()
        {
            picEl.attr("src",currentPicture);
        }
    );
</script>

But when I run this code, it says picEl is not defined. I think it could be because of closures but this code runs perfectly :

<script type="text/javascript">
    var currentPicture;//default picture
    jQuery("#backImageShower").hover(
        function(i)
        {
            currentPicture = jQuery("#dynloadarxdock > img").attr("src");
            jQuery("#dynloadarxdock > img").attr("src","back.jpg");
        },
        function()
        {
            jQuery("#dynloadarxdock > img").attr("src",currentPicture);
        }
    );
</script>

But also this code includes global variable and it works.

Can somebody tell me why?

Thanks.

---

The problem is that you're mixing the casing. The variable is declared as picEL but sometimes used as picEl (lowercase 'l', which is where your error is).

---

You are using picEl and not picEL.

 picEl.attr("src",currentPicture);

should be:

 picEL.attr("src",currentPicture);

---

You are using picEL everywhere except in the second hover function where you have - picEl.