CRM 2011-Run Report from Ribbon button

   1.  Create a new  web resource (javascipt) with following code

        

            function printOutOnClick(rdlName,reportGuid,entityGuid,entityType)

               {

                   var serverUrl = Xrm.Page.context.getServerUrl();
   
             var link = serverUrl + "/crmreports/viewer/viewer.aspx?action=run&context=records&helpID=" + rdlName  + "&id={" + reportGuid + "}&records=" + entityGuid + "&recordstype=" + entityType;
   window.open(link);
         }

.   2.Create a new button using visual ribbon editor and pass parameter  as follows

Function Name: printOutOnClick

Library: $webresource:<created web resource name>
1. String parameter Value: <Name of report file> ("somereport.rdl")

2.String parameter Value: < Id of Report >

3.Crm parameter: FirstPrimaryItemId //to pass current record id

4.Crm parameter: PrimaryEntitytypeCode //to pass entity code.