There are so many LIGHTBOX plugins witch one ot use?

Hi there…

I wish to use a lightbox plugin but there are so many and I can not seam to get any of them to work.

Basically I have tried a few and all of them say they automatically add the light box html code to the image links but this dose not seam to work.

I googled my butt off and final found the code to add to the href itself “rel=”lightbox[optionalgroupname]”

So I basically have it working…

Is there a way to set the lightbox so if the image is larger than the browser it shrinks to fit, or a zoom function or somthing, as some of the image I wish to add are pretty large?

Also witch lightbox plug-in should I be using? I do not want a full gallery type thing.. just to be able to add images to my blog and have tem load in that neat looking lightbox thing.