Customizing Gallery Lightbox

Hi there,

How can i customize the gallery overlay, in case i would add some discription to the the images in the light box,
One idea was to add inside the title a costume tag like this

<a href="images/01.jpg">jksjssj</h4>" data-lightbox="gallery-item">
the point is I can add this and i can pass the CSS to it, but in case i want to position it different way or i have some big text it is really sounds hard!!

I don't know where to find it in the JS files in case i would like to edit it (if i can) hehe.
or would be some easier way ??
and also how to remove the counter in the bottom like this one (1/5)

Thanks

it is not working here to paste the code nor to edit my reply, hope you can make it private, or delete it ..

jksjssj" data-lightbox="gallery-item">
i hope it is gonna be fine now