It is an effect most of the sites use around Christmas and the new year, but it is rather annoying and useless. Anyways, if you want to hide them on Argonath forums, there's a tutorial that works on Firefox which takes very little effort:
First, get an extension called Stylish; you can download it from
here. After you install it, an icon (letter S in a square) will appear on the bottom right part of your browser window. When you click on that icon, a menu will appear: select "Manage styles", and then "Write new style" on the bottom of the window. Give it a name - I named mine "Argonath forums" because I have some other styles for this site, but you can pick anything. Next, copy the following code and click "Save". Make sure the userstyle is activated after you create it.
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("argonathrpg.eu") {
html > div {
display: none !important;
}
}Also, if you learn/know CSS, you could add styles for different sites and change them how you want.