Refreshing the page to get the dog to walk sounds ridiculous and starting with tables isn't the correct way to learn now. Start with divs and CSS (position: absolute all divs to start with so they all take positions from the top left corner of the window then move on to position: relative).
Getting a dog to walk could be achieved with an animated gif http://www.whitsoftdev.com/unfreez/ (simple to create and not requiring Javascript or Flash) or using Flash which is advanced stuff.
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.