Learning jQ

 The setTimeout() function:

http://plnkr.co/edit/FG4kyMZmsmnCx9cbguyx?p=info

The setInterval() function():

http://plnkr.co/edit/5ny6s6QksGZk2gHsT6fq?p=info

To see how easy it is to toggle images with jQuery:

http://plnkr.co/edit/ZsD1BG3fEiaKmnfzovhR?p=info