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Thumb Lights Out For Earth Day CSS Javascript Tutorial Dark Page Switch
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Publish Date - Jun 22, 2012     Author - Adam Khoury
Lights Out For Earth Day CSS Javascript Tutorial Dark Page Switch
Learn to create a lights out for earth day script that uses light switch graphics and contrasting style sheets to allow the user to enter dark energy saving or dark theatre mode. You can choose to use dark overlays that disable all page content, or you can use this approach which darkens the page exactly the way you want and all page elements remain fully active.
Lesson Code
<!DOCTYPE html>
<link id="pagestyle" rel="stylesheet" type="text/css" href="default.css">
<style type="text/css">
img#lightSwitch {
background:url(images/light_switch_down.jpg) no-repeat;
<script type="text/javascript">
var mode = "default";
function swapStyleSheet(){
var pagestyle = document.getElementById('pagestyle');
var lightSwitch = document.getElementById('lightSwitch');
if(mode == "default"){
pagestyle.setAttribute('href', 'dark.css');
   lightSwitch.src = "images/light_switch_down.jpg";
   lightSwitch.title = "Turn the lights back on";
mode = "dark";
} else {
pagestyle.setAttribute('href', 'default.css');
   lightSwitch.src = "images/light_switch_up.jpg";
   lightSwitch.title = "Turn the lights off";
mode = "default";
<h1>CSS Javascript Lights Out Example</h1>
<img id="lightSwitch" onmousedown="swapStyleSheet()" src="images/light_switch_up.jpg" width="19" height="46" alt="switch" title="Turn the lights off"> <h3 style="display:inline;">Pink Floyd - Shine On You Crazy Diamond</h3>
<div id="special">
  <iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>
<h2>My web page has a lot off stuff on it</h2>

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at