I feel dumb for asking this...because it seems to be common knowledge among webmasters....but Im askin anyways

I want to have my pictures open in new windows

That will open the site in a window called "new"

That means that any other links with "new" in it, will be opened in the first "new" window.

<a href="link.htm" target="_blank"> will always open a new window.

_blank is a reserved word that will always create a new window.