This is a very nice and helpful addon. It lets you add a nice functioning login block. and best part is that its for…
Add beautiful jQuery Login dialog box and logout/account links at every page of your site.
This block uses the core login page to validate the user, and allows users to sign in using there concrete5 login credentials. The Register button hides if registration disabled by admin
Check out GitHub repository https://github.com/vr55/Concrete5LoginDialogBlock