Named Entity translator

Have some function in JavaScript what translate named entities in correct values (and vice-versa)?

By example:
Translate(" ") will return a white space " "
Translate("&") will return a ampersand "&"

Regards :thumbsup:
Denize

I have found this translator, what's your opinion?

http://www.saila.com/usage/tips/examples/special_characters.html