how to jquery load and use in codeigniter?

[eluser]nickname[/eluser]
Hello Everybody! i'm nickname.

I had a project was using codeigniter, i built a layout and all pages used it and i used jquery to load contents(load another controller were working) into layout' contents. but those controllers could not use jquery. so :
1). i had problem with jquery in codeigniter. i could not load jquery to codeigniter and i didn't know how to load it.
2). can you help me for these problem.? it is important for me.

thanks in advance

nickname need your help.