Forum:Wikia's custom codes

Hi, I'd like to know if there is a list of all custom Wikia's codes (pseudo parser functions, magic words...) for example:
 * (I don't think it's working this)
 * (I don't think it's working this)
 * __NOWYSIWYG__

Then on another matter, in CSS pages can I use the URL http://WIKI.wikia.com/wiki/Special:Filepath/FILENAME to set background images? Or is there an URL format that can be use as general URL for that image? I mean, like if that image will be updated then I won't have to update the URL too, because now I think I can only use the URL for a specific version... and what about the size? I searching for more flexible ways to use image URLs.