Calling other controller functions

[eluser]ApranaxFortress[/eluser]
I have three controller those are "blog_entries", "photos" and "comments"

comments controller has a funtion that is "comment_list"

i want to call this function from blog_entries and photos controllers is it possible ?

[eluser]pistolPete[/eluser]
http://ellislab.com/forums/viewthread/102768/
http://ellislab.com/forums/viewthread/100986/
http://ellislab.com/forums/viewthread/96446/