i was wondering how to make a pic a thumbnail on the page and when you click it you get a larger sized picture.If there is any html code or way to do this please let me know

There is script for an image zoom located in the
Bravenet Resourse Center This Link
will take you right to it

A thumbnail is a completely separate file to the main picture. Use a picture editing program such as Irfanview to create one.

Upload both files then link from one to the other. View source of the page I have linked to see the html.