You're right.
I've made a lot of search, and now I'm pretty sure what the problem is. But I don't know how to solve it.
div.slideshow span.image-wrapper {
display: block;
position: absolute;
top: 0;
left: 0;
}
This is where I should work. But when I add "vertical-align: middle;" it just doesn't work at all because vertical-align aren't effective on block elements. And since I have different image size that goes into that DIV, i can't just offset the items...
really I don't know what to do now