Integrate SSRS with SharePoint 2010

Hello,

We have an existing 2008 R2 SSRS server, and the database is configured as native. Recently, we also set up a SharePoint 2010 site, and would like to integrate reports from the SSRS server in the SharePoint site.

From what I've read, the SSRS database needs to be in SharePoint integrated mode. Since the report server has already been set up, is there any way to do this? Can the existing database be altered? Are we out of luck?

If I change the existing ReportServer database to SharePoint integrated mode, will it have any effect on existing reports/functionality?

Thanks for any assistance.

Tomt