script refactoring

scripts/script.js

 var url = document.location,
-	domSlides = document.querySelectorAll('section.slide'),
-	slides = [], backhash = {},
 	linkScreen = document.querySelector('link[title=screen]'),
 	linkProjection = document.querySelector('link[title=projection]'),
+	shower = document.querySelector('div.shower'),
+	slides = document.querySelectorAll('section.slide'),
+	slideList = [], hashList = {},
 	fullscreen = false;
 
-for(var i = 0, iLength = domSlides.length; i < iLength; i++) {
-	var id = domSlides[i].id;
-	slides[i] = '#' + id;
-	backhash['#' + id] = i;
+for(var i = 0, slidesLength = slides.length; i < slidesLength; i++) {
+	var id = slides[i].id;
+	slideList[i] = '#' + id;
+	hashList['#' + id] = i;
 }
 
-function enterFull() {
-	fullscreen = true;
-	updateView();
-}
-
-function exitFull() {
-	fullscreen = false;
-	updateView();
-}
-
-function toggleFull() {
-	if(	window.fullScreen || // Firefox
+function toggleFull(force) {
+	fullscreen = (typeof force == 'boolean') ? force : (
+		window.fullScreen || // Firefox
 		document.webkitFullScreen || // Webkit
-		screen.width == window.outerWidth && screen.height == window.outerHeight ) {
-		enterFull();
-	} else {
-		exitFull();
-	}
+		screen.width == window.outerWidth && screen.height == window.outerHeight
+	);
+	updateView();
 }
 
 function turnSlide(e) {
 	if(!fullscreen) return;
-	var current = backhash[url.hash],
-		target,
-		command;
+	var current = hashList[url.hash],
+		target;
+	if(e.type == 'keyup') { // Key-Based
 		switch(e.which) {
 			case 33 : // PgUp
 			case 38 : // Up
@@ -53,23 +43,32 @@ function turnSlide(e) {
 			default:
 				return;
 		}
-	target = slides[current];
+		target = slideList[current];
 		e.preventDefault();
+	}
+	if(typeof e == 'number') { // Specific
+		target = slideList[e];
+	}
+	if(typeof e == 'undefined') { // Next
+		target = slideList[current++];
+	}
 	if(target) url.hash = target;
 }
 
 function updateView() {
 	linkScreen.disabled = fullscreen;
 	linkProjection.disabled = !fullscreen;
-	if(fullscreen && !backhash[url.hash]) url.hash = slides[0];
+	if(!hashList[url.hash]) turnSlide(0);
 }
 
-domSlides[0].addEventListener('click', enterFull, false);
-
-window.addEventListener('DOMContentLoaded', toggleFull, false);
-window.addEventListener('resize', toggleFull, false);
+slides[0].addEventListener('click', function(){
+	toggleFull(true);
+}, false);
 
 document.addEventListener('keyup', turnSlide, false);
 document.addEventListener('keyup', function(e) {
-	if(e.which == 27) exitFull();
+	if(e.which == 27) toggleFull(false);
 }, false);
+
+window.addEventListener('resize', toggleFull, false);
+window.addEventListener('DOMContentLoaded', toggleFull, false);
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