At the moment you're prepending the div to the image. This will prepend the image to the div:
$('.catItemView').prepend($('.catItemIntroText img'));
If you have this structure more than once on the page though, you'll want to do this to get the desired result for every occurrence:
$('.catItemIntroText img').each(function() {
$(this).parents('.catItemView').prepend($(this));
});