It isn't a popup window but a form of lightbox, albeit one where (a) the lightbox is movable, and (b) the lightbox doesn't make the rest of the page temporarily inaccessible (I hereby create a new word, inertify). I don't know if that's what you meant, but the two are very different – a popup is a new window that will have a separate entry on the taskbar and in Alt+Tab, although with the advent of tabbed browsing it could just as easily be a new tab in an existing browser instance – a lightbox is a layer added to an existing page that allows/requires interaction, but runs within the same browser context (window/tab).
My question? When I try and add this same search function to the other pages of my site the results open in another window - not the same window as I want. For the life of me I can't figure out how I did it. Lol. I've search high and low. I also see no settings in the search widgets parent site. I realize that may be a bit hard to find, but I'm hoping one of you has some magical debugging app. Thanks.
Might be easier if you create a dummy page with this behaviour not working, and then we'll have a better chance of figuring out where it's going wrong.