Crystal Report Viewer Export & Print buttons are not visible/working in VS 2008 when deploy on server

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ASP.NET4

Dear Sir,

I have used Crystal Report Viewer for showing reports in my application(asp.net,c#). after deploy in server All the buttons of the toolbar are working. but not visible, and export & print button's on Crystal Report Toolbar are not working . Cicking on to that they will show a exclamation marked yellow coloured triangle box written as " Done but errors on page." in status bar. Clicking on to that yellow triangle it will show "Object doesn't support this action" . if i browse from system having .net 2.0 (installed) only that pictures and all visible.

**At local server everything is working correctly even in LAN client machine it is working fine.

Kindly advise me what I have to do.

i also copy the CrystalReportWebFormViewer3 from 'aspnet_client\system_web\2_0_50727\CrystalReportWebFormViewer3\JS’ this path
and copied in my server 'aspnet_client\system_web\2_0_50727\.

but till now its not working.