Deployment to web server set up. blank page

What are the configurations setting/procedures,  we need in order to  run a crystal reports from a website?

My reports runs in VS 10 on my local machine and on the web server. (win 2008 R2).
The report runs from a web form. (BuyReport.aspx).  I'm able load, run, and display the report in all browers.

I copied the crystalreportviewers13 folder to my website.
I added the
  <crystalReportViewer>
          <add key="ResourceUri" value="~/crystalreportviewers13" />
  </crystalReportViewer>
to my webconfig file.

But I'm getting a blank page.