how to change default pager for tab completions from 'more' to 'less'

[tom arnall <kloro2006@gmail.com>]

if i use tab completion, and there are a lot of possibilities, 'more'
is used as the default pager to show the list. I want to see the list
with the 'less' pager.

example:

     ~/$ cd<tab>

will get:

    Display all 150 possibilities? (y or n)

if i enter 'y',  the 'more' pager is used to display the list.  ;o(

i want 'less'.  ;o)