Your responses have been exceptionally helpful! I've pulled out the reference and everything is now loading. So good news there.
I've also added the onload window event, as is in my sample HTML code. Oops. Bad programmer (me).
I have a more fundamental problem that I would hope I could impose on you slightly to resolve. None of my prior coding experience is Web 2.0, AJAX, Javascript, what have you, so this is very new to me. My prior experience has been server-side DOM rather than shared- or client-load.
I feel I'm missing something very basic here ... when the user clicks "Submit," I don't want the form to cause any change in the background page. Where I have an alertbox now, I plan to insert these values into a hidden text field (I saw some examples out on the LimeSurvey documentation pages). I think I'll end up wanting code like the "Back to Top" <div> on this very forum. I see that document.ready was used here rather than document.onload. I suspect document.ready is the better trigger.
Again, I feel this is pretty basic (and not within the scope of LimeSurvey support, per se), but I'm somewhat stumped after spending a few days going from knowing nothing about CSS <div>s and knowing nothing about jQuery/Javascript to where I am not.
Any pointers?