Substraction by click of mouse

[tetrapro]

Hello, I am new here and newbie in php. I found a website http://www.zambesc.com/repartitie/index.php and there are some tables and calculations. When I click on a column like "Bucuresti" the number decreases by one unit in that column and on the column Total. Then on the upper-left it`s a button "Snap on changing" that changes the number as it was before. And also a reset button that changes all as it was at the beginning. This is a google translation of the website: http://translate.google.ro/translate?js=y&prev=_t&hl=ro&ie=UTF-8&u=http%3A%2F%2Fwww.zambesc.com%2Frepartitie%2Findex.php&sl=ro&tl=en I want to create the same thing but with different data. If you can give some pointers or some manuals that I can read on how to do that. I want a simple page that I can run offline on my laptop. Thank you.