LockMyMac is an AppleScript based free app to lock your Mac with screensaver running background !
You can download this app from this url http://cl.ly/2r3E2D3N1D29 ! copy it to your Applications Folder then
drag "LockMyMac.app" to your dock !
simply click dock when you want to lock your Machintosh , type your user password to unlock ! during lock mode your
screensaver will appear and runs as background !
During lock mode all running apps remain running state !