unfortunately, you're probably gonna have a hard time finding a slideshow or
gallery that doesn't involve at least a little bit of coding. and the fact of
the matter is, if you're serious about web design (or at least having a decent
site) you're going to have to familiarize yourself with html code. you don't
have to know how to write an entire page with just code, but at least knowing
how to edit it is a must.
having said that, check out
http://www.dynamicdrive.com for slideshows and
galleries. they do involve pasting code into the code of the page (at least the
one i've used do), but they give you instructions on how and where to put it.