Any issues using these through asp.net Reportviewer?

I get javascript errors I can't make out when I select the calendar.
and the date parameters are disregarded and set to defaults when I
post.


I'm sending Credentials to the report from the codebehind this way:


Protected Overrides Sub OnLoad(ByVal e As EventArgs)
        Dim Roles() As String =
GetRolesForUser(Page.User.Identity.Name.ToString)


        Dim cred As New Retailer.ReportServerCredentials("myuserv",
"mypassword", "mydomain")
        ReportViewer1.ServerReport.ReportServerCredentials = cred


        Dim param As New ReportParameter("r_user",
Page.User.Identity.Name.ToString)
        Dim param2 As New ReportParameter("r_role", Roles(0))
        Dim p() As ReportParameter = {param, param2}
        ReportViewer1.ServerReport.SetParameters(p)
        ReportViewer1.ServerReport.Refresh()
    End Sub
End Class


Otherwise the report displays perfectly and the internal parameters work fine.


My client is IE 7.0.


Thanks for any help or information.