How to use models?

[eluser]zoran119[/eluser]
[quote author="asciiCode" date="1283895247"]Also, do you need to call $this->load->model('Model_name'); in every function of a controller class or can you just call it once from the index or constructor functions and then use it in all of the functions of the controller?[/quote]

i call it in the constructor function of the controller. the code in my post was just for demonstration.