Pear and SQLServer

Hi, this is Rafa from Barcelona, Spain. I'm developing a project which runs on PHP + SQL Server, and I'm also using PHP SiteManager (my company has just adapted it as common framework). SiteManager uses PEAR as abstraction layer to access databases, and this is the beginning of my troubles. I had tried previously PEAR against MySQL tables, and it worked fine, but it seems that something doesn't work fine with SQL Server. I'm trying to establish connection with SQL Server and it's totally impossible. The DSN I'm sending to PEAR is the following one : <VAR name="DSN" value = "mssql://Lavinia:*******@RGIMENEZ/Santillana" /> Where am I going wrong ? Does the SQL Server connection need any special parameter ? Has any of you used PEAR and SQL Server ? Before start checking the PEAR code, I'd like to get some feedback from the rest of users. Thank you in advance... R.