I have done more tests. With a computer with win ME and other one with Win XP SP2.
With the browsers Opera, Firefox, Netscape and IE.
Though the image does not exist, when one access to a page where it is this sigature,
it tries to install the cookie of casinoguru.
If it does not ask for it, it is possible that already it is yet installed.
In opera I can see it with its name, but in IE, this is the above mentioned name .
You can try with IE, with preferences->Internet option->Privacity->Advanced-> asking to install cookies,
deleting all the cookies in its directory, and returning to access to the page.
It asks one from xoops and the other one casinoguru.
It has been called me the attention, because when i am having acceded to some web sites,
sometimes continuous popup windows are opened in my browser to inviting me to game in a "casino".