Previously I have posted how to show form notification for CRM 2011. Read the post
However, due to the recent release of Update Rollup 12, this does not work anymore.
The issue is getting the
Pre Update Rollup 12
var notificationsArea = document.getElementById('crmNotifications');
Post Update Rollup 12
var notificationsArea = Sys.Application.findComponent('crmNotifications');