In Russian Wikisource I was looking at a book, where lists of literature references contain a mix of Russian and German titles. This book was OCRed for Russian, so when the print says "Barentz" in Latin letters, the OCR text says "Вагепгг", which are Cyrillic (Russian) letters that look similar, but actually transcribe to the nonsense "Vagepgg".

When proofreading such a text in a wiki edit box (using the ProofreadPage extension, as Wikisource does), it would be a great help if all Cyrillic letters (a range of Unicode characters) in the edit box could be coloured different from the Latin ones. Is this possible to achieve with a personal or site-wide Javascript, stylesheet or gadget?

What I would like is a gadget that allows the user to decide if Unicode range XX to YY in the edit box should be coloured in ZZ,

Here is a diff link to the page in question, http://ru.wikisource.org/w/index.php?title=%D0%A1%D1%82%D1%80%D0%B0%D0%BD%D0... The large print is the text of an encyclopedic article. The small print is the list of literature references.