Q:

updating dom text based on click in jquery

My Simple HTML Structure:
<html>
    <body>
<p id="5">
    My Text Qoted Here - 
    <span class="author">Author </span>
          <br>
          <span class="uptext">20</span>
          <img class="im" class="upimg" 
          src="http://bgathinktank.files.wordpress.com/2011/01/vote-button.jpg" />
          <img class="im" class="downimg"
          src="http://2.bp.blogspot.com/_XeuZ1yDnv4Q/TSUkAT6T1dI/AAAAAAAADR8/nPHP4JvVxy8/s1600/vote.jpg" />
          <span class="downtext">5</span>
          </p>
</body>
</html>       

as can be seen there are two images, and i want to change the count of the image based on which image is clicked. 
i write the following jquery code for it:
$(function() {
 $(".upimg").click(function(e) {
        e.preventDefault();
        alert("here1");
        curr_val = $(this).closest(".uptext").text();
        nos = parseInt(curr_val, 10) + 1;
        $(this).closest(".uptext").text(nos);
    });

    $(".downimg").click(function(e) {
        e.preventDefault();
        alert("here2");
        curr_val = $(this).closest(".downtext").text();
        nos = parseInt(curr_val, 10) + 1;
        $(this).closest(".downtext").text(nos);
    });

});

But it does not seem to respond. 
You can find the fiddle here

A:

Your <img> tags have two class attributes:
<img class="im" class="upimg"

Try changing that to
<img class="im upimg"

Also, the closest() method returns the closest parent element, not an adjacent sibling, so to find the correct uptext element, you need to use:
$(this).prev().text()

