adding lighbox effect to fck

Hello to everybody, I'm new forum user but I'm old fck editor user.
Last year I was implemented lighbox effect in my fck editor
but after I was implemented ajax pagination script for my pages this lighbox doesn't work. After some research I found solution but only for static content. Since my content is dynamic how can I alter /editor/dialog/fck_image/fck_image.js function UpdateImage( e, skipId ) to allways add e.src = GetE('txtUrl').value ; onclick="myLightbox.start(this); return false;" before rel="lighbox".

Now I have a code for images like this: <a title="" rel="lightbox" href="/upload/userfiles/image/imageName.jpg"> and I need this
<onclick="myLightbox.start(this); return false;" rel="lightbox" href="/upload/userfiles/image/imageName.jpg">

I hope I was clear and hope someone will have enough time to share solution with me. Any help please.