Is it possible to set the src attribute value in CSS? At present, what I am doing is:
Put several images in a "controlling" container, and change the container's class instead. In CSS, add rules to manage images' visibility depending on the container's class. This will produce the same effect as changing img src property of a a single image.
HTML:
CSS:
#light { ... }
#light * { display: none; } // all images are hidden
#light.red .red { display: inline; } // show red image when #light is red
#light.yellow .yellow { display: inline; } // .. or yellow
#light.green .green { display: inline; } // .. or green
Note that it will preload all images, like with CSS backround-images, but unlike changing img src via JS.