To add accented letters and other symbols to a webpage, you can use the numeric or name codes shown below.
How it works:
HTML Codes - Characters and symbols
Orthographic diacritics and multilingual computing
Character finder - a site where you can find out which accented letters or other characters are used in which language(s), and other useful information about characters, fonts and unicode: http://transliteration.eki.ee/
If you need to type in many different languages, the Q International Keyboard can help. It enables you to type almost any language that uses the Latin, Cyrillic or Greek alphabets, and is free.