image zoom?

Hi, longer time I am trying to find image zoom plugin but I don’t succeed or I don’t know how to make it to work. now, in my blog, when I click thumbnail, I get next page with image and than when I click it I get big, originla size, image. well, I don’t want this “next page” than automatically big image.
I found expand images plugin, at homepage of plugin it is like I need, I click thumbnail and get big image, but when I installed at my blog, again, it was the same as before, I get stupid next page and then big image.
so, can anyone explain me what to install and how to set it in order to get finally what I want: thumbnail at my blog, when someone click it, he should get big image and not stupid next page with image.