jQuery chokes on a page without doctype .dtd file reference

Hello everyone.
I have a little piece of jquery running... i found it chokes on IE.. IE always renders the "else"
Firefox and Chrome work perfect.

If you duplicate this code in 2 files and then put the doc type for one as
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 
and the doc type for the second as
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

The rest of the file is the same.
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

</head>
<div id="rightFloat" style="width:200px;border:thin solid pink;">
HEY I Am Here!
</div>
  <img src="justj.jpg" />
    <script language="javascript">
        if ($('img[src = "justj.jpg"]').length) {
            //if the image with that src exists
            document.getElementById('rightFloat').style.display = "block";
                  document.write("Yippeee.. I display block!")
        } else {
            document.getElementById('rightFloat').style.display = "none";
                  document.write("I am the else statement, I display none!")
        }
</script>
</html>

You notice that in firefox and chrome - BOTH WORK and the condition pops up the div.
You'll notice in IE, that the one without the .dtd reference in the doc type does NOT WORK

If I can not change the doc type.. is there anything else to consider why IE would choke on this particular code snippet and not other instances of jquery?
jmcreativeAsked:
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Albert Van HalenConnect With a Mentor Analyst developerCommented:
Try and use the ends-with selector. See http://api.jquery.com/attribute-ends-with-selector/
Perhaps also check for length > 0. Because it returns the jquery object which always have a length property. Length being the number of elements matching the criteria.
if ($('img[src$="justj.jpg"]').length > 0)

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jmcreativeAuthor Commented:
Excellent. That did work.
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