Updated to nearly fully functional. Pre-release 1. Still needs some UI changes in the slideshow and admin pages (move the save button & fix the save detection for the internship list). Customer had one more page change request which I need to re-define and handle.

imports/ui/PhotoGallery.js

@@ -1,2 +1,109 @@
 
-import './PhotoGallery.html';
+import './PhotoGallery.html';
+
+let PREFIX = "PhotoGallery_";
+
+Tracker.autorun(function() {
+	Meteor.subscribe("pages");
+	Meteor.subscribe("slideshow");
+});
+
+Template.PhotoGallery.onCreated(function() {
+	let template = this;
+	this.slideshows = Meteor.collections.Slideshow.find({}, {sort: {name: 1}});
+});
+Template.PhotoGallery.events({
+	'click .galleryLink': function(event, template) {
+		let slideshowId = $(event.target).data("slideshow-id");
+		let slideshow = slideshowId ? Meteor.collections.Slideshow.findOne(slideshowId) : undefined;
+		
+		Session.set(PREFIX + 'selectedSlideshow', slideshow);
+	}
+});
+
+Template.PhotoGallery.helpers({
+	editableHTML: function() {
+		let doc = Meteor.collections.Pages.findOne({name: "Slideshow"});
+		
+		return doc === undefined ? "" : doc.html;
+	},
+	slideshows: function() {
+		return Template.instance().slideshows;
+	},
+	slideshow: function() {
+		return Session.get(PREFIX + "selectedSlideshow");
+	}
+});
+
+
+Template.Slideshow.onRendered(function() {
+	let template = this;
+	
+	this.slideTimer = Meteor.setInterval(function() {
+		let current = template.$('.slide.showSlide');
+		
+		if(current) {
+			let next = current.next();
+			
+			if(next.length === 0) {
+				next = template.$('.slide:first');
+			}
+			
+			current.removeClass('showSlide');
+			next.addClass('showSlide');
+		}
+		else {
+			let first = template.$('.slide:first');
+			
+			if(first) first.addClass('showSlide');
+		}
+	}, 6000);
+});
+Template.Slideshow.onDestroyed(function() {
+	if(this.slideTimer) Meteor.clearTimeout(this.slideTimer);
+});
+Template.Slideshow.helpers({
+	slides: function() {
+		return Session.get(PREFIX + "selectedSlideshow").images;
+	}
+});
+Template.Slideshow.events({
+	"click .next": function(event, template) {
+		let current = template.$('.slide.showSlide');
+		
+		if(current) {
+			let next = current.next();
+			
+			if(next.length === 0) {
+				next = template.$('.slide:first');
+			}
+			
+			current.removeClass('showSlide');
+			next.addClass('showSlide');
+		}
+		else {
+			let first = template.$('.slide:first');
+			
+			if(first) first.addClass('showSlide');
+		}
+	},
+	"click .previous": function(event, template) {
+		let current = template.$('.slide.showSlide');
+		
+		if(current) {
+			let previous = current.prev();
+			
+			if(previous.length === 0) {
+				previous = template.$('.slide:last');
+			}
+			
+			current.removeClass('showSlide');
+			previous.addClass('showSlide');
+		}
+		else {
+			let last = template.$('.slide:last');
+			
+			if(last) last.addClass('showSlide');
+		}
+	}
+});