unicode to ascii for look-like letters

[Skaperen]

does anyone know of a module or database to convert Unicode to ASCII of look-like letters? by that i mean any codes above 127 that have an appearance like or similar to a letter or any character in ASCII gets translated to that letter or character in ASCII that it looks like. for example the letter "A" with a variety of different accent marks or different display effects get translated to "A". if it wants input and/or gives results as numeric codes, that's OK.