drop down autopopulatin for codeigniter

[eluser]alexaaaaaaaaaa[/eluser]
Hi i have one problem and i know that it can be solved with jquery ajax or whatever but i'm not an expert in codeigniter.
here's my problem:
I have 2 tables releated like Main category and subcategory and i want to make 2 drop downs lists for egs: if i select Cars the next drop down it'll be populated with all subcat from cars and so on.
Please help me.
Thanks

[eluser]Cristian Gilè[/eluser]
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Code:

chained select

Cristian Gilè