The above code will load the jquery globally on the masterpage and you dont have to deal with making sure it reference everytime or in JS files.
Again, I am not going to reinvent the wheel.
As more and more enterprise are embracing Cloud and Office 365, I thought that this will be a great time to start writing up on branding your Sharepoint Online, which comes part of the package with Office 365.
Sharepoint Online comes configured with the Top Navigation Bar for you. But we want to hide it, as i dont have all the Sites that I created to be shown in that portion.
You can add the following the master page or add this to a content editor webpart.