How do make a virtual pet, like the ones that hatch and grow once you post them on you web page?

tiffy w: How do make a virtual pet, like the ones that hatch and grow once you post them on you web page?
Those pets that they post up and have a code where you can put in html on your webpage. They hatch then grow, I want to know how to make them. Not making a pet site, just those growing creatures. Could you give me the link to a web that explains it or give me the exact instructions?

Answers and Views:

Answer by Thank You Very Much
You might better help if you post this question in the Games & Recreation section of Yahoo Answers since this is only for living pet animals.

Yahoo Answers>Games & Recreation…. https:///dir/index?link=list