If this is accepted I can finally make myself a "Fancybox"

It already has an id. HTML source:

<a href="#" id="lightbox-secNav-btnClose">
<img src="/common--theme/base/images/lightbox/lightbox-btn-close.gif">
</a>

aha! I will try this later…can I message you if this works or not, I do remember in the past trying this, but it doesn't work fully like it should.

Sure. The image is included in the HTML, so you would have to hide that, and then apply a background image to the <a> element.

Will do, thank you Bryce :)

~ However, using a new ajax loader would complete this, so adding a class to the loader would be cool.