Is this php file (with an image) being loaded every time the page is visited?

Question

I wanted the images to be loaded only when the user click the link:

<a id="showcase1" href="showcase/showcase1.php"><img src="images/showcase1t.png"/></a>

So I placed the images in another php file and call the using ajax and fancybox:

showcase1.php:

<div id="inline1">
 <img src="images/showcase1.png"/>
 <a href="http://studyatbest.com"&gt;studyatbest.com&lt;/a&gt;
</div>

I'm not very familiar with ajax.

Is the image from showcase1.php being loaded every time someone visit the page. Or just when I click the anchor link?

(The problem is that I'm not sure if showcase1.php and the image inside the file are: 1. being loaded but just not displayed. 2. or being loaded in the right moment I click the anchor link.)