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DIV Conditioning - Checking if an IMG exists within a DIV

I have the following lines of code in my website:
HTML:
<div class="the-post-thumbnail">
<p><img src="http://placehold.it/350x150/FF0000/FFFFFF?text=Automatic+Thumbnail" alt="" width="" height="" /></p>
</div>
<div class="post-body">
<p><img src="http://placehold.it/350x150/00FF00/FFFFFF?text=Manual+Thumbnail" alt="" width="" height="" /></p>
<p>Paragraph</p>
<p><img src="http://placehold.it/350x150/0000FF/FFFFFF?text=Body+Image" alt="" width="" height="" /></p>
</div>
JavaScript/jQuery:
var ele = $('.post-body p:has(img):first');
if ($('.the-post-thumbnail img').length) {
ele.hide();
}
else {
ele.show();
}
What I am trying to do is:
Check if there is an image within the the-post-thumbnail div and if so, hide the manual thumbnail image within the post-body
Check if there is not an image within the the-post-thumbnail div and if so, show the manual thumbnail image within the post-body
This is partially working, however, what I've noticed is that if I remove the manual thumbnail image from within the post-body div, it will remove the second body image after the paragraph tag as well.
How can I target just the manual thumbnail image which is directly within the post-body div correctly so that I can achieve the two list items above, without adding additional classes?
FYI:
This is due to swapping my website's theme for a different one. The older version required me to place in a thumbnail image for each post manually at the top of the article, and the new theme does this for me automatically. This resulted in duplicate images for older posts.
CodePen Example

Working fiddle.
Just changing the position of :first selector should do the work, because it will select always the first p and check if it has an image :
var ele = $('.post-body p:first:has(img)');
Hope this helps.

Without using any extra selectors, you could check for an image in the first paragraph.
var ele = $('.post-body p:eq(0):has(img)');

How to put the ALT-value of an image into a variable in javascript or jquery

I’ve made a cardspread program that is based on the source of the image. It works allright, but it is loading slowly, because now 78 different cards are loaded. I like to speed up the loading and I thought I needed an extra item per DIV. So I added an ALT-tag to each image. Like this:
<div id="kaart1">
<alt=kaart14.jpg>
<img src="images/kaart1.jpg" width="110" height="180" onclick="showDiv(event)>
</alt=kaart14.jpg>
</div>
Now I need only 1 image to load 78 times, which is faster. The problem which I am facing now is that I want to read the alt value into a variable (in this case: kaart14.jpg).
I’ve tried :
$('.status').click(function() {
var status = $(this).attr('alt');
});
But that stays empty. Does anyone have a suggestion how to solve this in Javascript or jQuery?

First, there is no <alt> tag. It is used as alternative to <img>. The value is displayed if the image is not loaded.
It is just plain text. If you put a url there, it will just display the url and not the image itself.
Eg:
<img src="myphoto.jpg" alt="This is my photo">
There is no performance gain if you use alt or not, but you definitely SEO

Your alt attribute should be like
<div id="kaart1">
<img src="images/kaart1.jpg" alt="kaart Image" width="110" height="180" onclick="showDiv(event)>
</div>
alt is an attribute of the img tag,its not a tag itself.And as #Bergi said,the alt attribute will not be an another image.It may be the description.

Image thumbnail is not loading and onmousehover my images move up when hovering over an image?

?I am having an issue with a website i uploaded to test. They all work work fine when they are checked locally in Dreamweaver cs6 but when uploaded they do this, Roll over the images you will see the problem, when hovering over Texas longhorn image there is a problem and the Michigan state image isn't loading Anyone see my error.
Here is the code that matters Thanks for any help And the link to the site page http://odintest.co.nf/product_select.html
<script type="text/javascript">
function changeImage(a) {
document.getElementById("img").src=a;
}
</script>
<div id="main_img">
<img id="img" src="images/placeholder.jpg"/>
</div>
<div id="thumb_img">
<img src='images/notredamelogo.JPG' width="200" height="150" onmouseover='changeImage("images/notredame.JPG");'>
<img src="images/ohiostatelogo.jpg" onmouseover='changeImage("images/ohiostate.jpg");'>
<img src='images/michiganstatelogo.jpg' onmouseover='changeImage("images/michiganstate.jpg");'>
<img src='images/floridagatorslogo.jpg' onmouseover='changeImage("images/floridagators.jpg");'>
<img src='images/texaslonghornslogo.jpg' onmouseover='changeImage("images/texaslonghorns.jpg");'>
</div>

I don't know what problem you're describing, but I'm guessing a hover delay. Use a javascript preloader or load them in a div with styles along the lines of {position: absolute; left: -999em;} to keep them offscreen. This makes the images available immediately on hover, where normally you'd see a delay while they're downloaded.
The image at http://odintest.co.nf/images/texaslonghorns.jpg doesn't seem to exist on the server.

Well I see 2 issues.
For me the "notredamelogo.JPG" did not load. Probably because of "JPG". Try "jpg" instead.
Main image does not load for texaslonghorns. That might be because the image does not exist in that directory and/or the image name or extension is not right.

Automatically scale an image to match text height

I've got an image which I want to use inline with some text, but I need it to match the text height. I know it's possible to something like <img src="img.jpg" height=16> or even <img src="img.jpg" height="100%">, but the former does not scale with text size and the latter seems to make it the size of the div, not the text height. Can anyone help?
Example HTML:
<body>
This is a test <img src="img.jpg">
</body>

Did you try this giving the image height as 1em?
img {height: 1em;}
Check out the fiddle here: http://jsfiddle.net/yAr7z/

HTML/Javascript Overlaying Images on Region Mouseovers

So I have an image on a page and an imagemap corresponding to that image, then I also have two corresponding images, each the same size as the first (mostly transparent) that I want to overlay onto that image when a certain region of the imagemap is moused over. How would I go about doing that, is this something I can accomplish with CSS or will I need javascript for it?

I think you do need Javascript as not all browsers support css hover psuedo-class on elements other than <a>. You should be able to do it with minimal Javascript. See the <map> tag: http://www.w3schools.com/tags/tag_map.asp
For example, if you want mousing over the 100 by 100 pixel square in the top left of your image (image1.png) to enable the overlay image (image2.png):
<script type="text/javascript">
function area1_mouseover() {
document.getElementById('image2').style.visibility = 'visible';
}
function area1_mouseout() {
document.getElementById('image2').style.visibility = 'hidden';
}
</script>
<img src="image2.png" id="image2" style="position: absolute; visibility: hidden; z-index: 2;" usemap="#my_map" />
<img src="image1.png" id="image1" usemap="#my_map" />
<map name="my_map">
<area shape="rect" coords="0,0,100,100" onmouseover="area1_mouseover();" onmouseout="area1_mouseout();" />
</map>
Edit: applying the map to all the images should solve that problem since they are all the same size.