by using all opertors i want select one operator only on one query item

[venkatasomaraju]

hi all
i have one query item in my report that is posteddate
user will choose or  enter the posteddate
i want apply some opertaors using
=equl
<>not equal
< less than
>greater than
>=greater than or equal
<=less than or eual
begins with
contains
ends with
like
between
null
is null
but user can choose any one only

Example
posteddate
user he will select < 10-jan-07
other wise between 10-jan-07 and 20-jan-07
same all operators above
how will choose above all operators on posteddate
please send me the steps