jqgrid not showing XML data whit special characters (ñ and accents)

[BleatlyFece]

I just deployed a php application that uses jqgrid, the problem is that the jqgrid loads data from XML responses, on Google Chrome it works, ugly but it works, some weird characters are replacing the accent characters and the ?.On IE and firefox, not working at all.What are the things I must check?All in the application is using utf-8 but the database (sql server) has COLLATE = Modern_Spanish_CI_AS