Cookies are small information pieces saved by web sites on your computer.
The next time you visit the same web site, or another page on the web site, the information is read back from your computer.
This web site uses cookies to change the font size (-, 0 and + on top to the left) because this is done by reloading the page.
You may turn off the use of cookies by changing the settings in your web browser so it does not accept cookies. See your web browser's manual or help file for instructions.
Without cookies the change of the font size will not work.