Brief introduction to Boolean algebra (or propositional Logic)

When writing conditional statements, such as if (condition) { ... } else {... }, its helpful to have a basic understanding of the laws of logic (or more formally Boolean algebra) that connect conditional statements together. These can be described by the operation of just 3 connectives, They are

Problem specification - Adding a Table of Contents.

The aim is to be able to show a complete novice to HTML, how to add a Table of Contents (TOC) to a page inside a pair of div tag (with id="toc") provided for this purpose. Initially the TOC should list all H3 headers. and each item in the TOC must include a hypertext link to the relevant (h3) paragraph. Then having established a procedure, to use javascript to achieve the same result automatically.

Scaling animation effect with the GIMP

Here is a animation to demonstrate the effects of scaling based on Alice in Wonderland, based on the GIMP version 2.8. Having drunk the magic potion Alice begins to shrink. Instead of Alice its more fun if you shrink yourself. All you need is a digital camera with a timer, a tripod and a basic knowledge of the GIMP. If you don't have a timer on your camera, or a tripod, then you'll need a friend to take a couple of pictures for you.

SoSLUG's Alan Campion, has done a wonderful job of teaching us all about things we can do using the new HTML5 canvas tag. This is designed as a supplementary article to his efforts, to show some things you can do with the HTML5 canvas tag to save/serialize it's data for use elsewhere.