serch engine in my own webiste using code igniter

[eluser]Unknown[/eluser]
I have a site made using code igniter and now i have to give a function of seach in my website that serches through keyword given by user through input text field.
Is there any concept of how i make this possible?
I have read about php search script Sphider.I like it but don't know how to integrate it within my website.So can anyone help me.
Thanks