How To Generate Any Report That The User Selects From A List

I know this a simple question but I cannot find an example of using the ReportExecutionService to render a report that doesn't take any parameters. Can somebody provide and example? Or to make it easier, tell me what to change in the msdn example: http://msdn2.microsoft.com/en-us/library/microsoft.wssux.reportingserviceswebservice.rsexecutionservice2005.reportexecutionservice.render.aspx


Thanks in advance,

Chris