With a little search and sense, I managed to get most of what I was trying to do. That is, some of my images may be a little big to display so I wanted to toggle them via a button. I've got that part down pretty good, I think with the help of the search function.
<<set $dayimage to $args>> <<set $nightimage to $args>>
<<button "Toggle Image">><<toggleclass "#i" "hidden">><</button>>
<div id="i" class="hidden">
<<print '<img src="' + $nightimage + '">'>>
<<print '<img src="' + $dayimage + '">'>>
<<imagetoggle img/Home/Room_Day.jpg img/Home/Room_Night.jpg>>
But I'm having trouble doing it in reverse. I was thinking I could have it be an option to have images displayed by default or not. So, if $default ... display: block; ?
A little lost where to go from here.