Hi,
The problem comes from that Magic Quotes in Joomla 3.0, all apostrophe ‘ and quotation ” characters seem to be escaped by slashes / for text fields and textarea fields.
So either de-activate it on the whole hosting package, or edit php.ini file with the following code:
; Magic quotes
;
; Magic quotes for incoming GET/POST/Cookie data.
magic_quotes_gpc = Off
; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc.
magic_quotes_runtime = Off
; Use Sybase-style magic quotes (escape ' with '' instead of ').
magic_quotes_sybase = Off
Hope it helps.