create a dynamic calendar from the database

Advancing a calendar ready, making the effect of moving from one month to another, and seeking events in a mysql database. I will implement in codeigniter. Optional: if you know the codeigniter make up the framework ocalendário already exists in html / css, he appears in two pages, the initial smaller in size and in their own page named Calendar in larger size the same size, the difference in your page has the information of the events immediately underneath the calendar is attached the images for better comprehension. is something very simple, has to have effect from a calendar to another transaction can use ajax to fetch the events, I have also sql. events are separated by categories 4, and their colors. more questions send me a message privately.