I'm confused by the use of the word 'title'..
The closest thing I can think of (and this is not for IE, but rather Firefox or Opera) is to open a new tab, and enter 'about:config' in the url field. This will bring up that browser's list of attributes you can modify... There is a search window that you can enter key words like 'background' or 'color'.. you should be able to trackdown and modify your browser's defaut charactistics.. but just so you know, this will not override webpage CSS declarations.
If you are refering to the 'title' that appears in a tab when you visit a website, as Nog has mentioned, this is not modified through the browser.. this is a windows thing (which is completely different).
Cheers,
NRG