mdx function to find range for 2 Hierarchies

hi,

I an trying to write an mdx function to find range between 2 Hierarchies.

i have InTime Hierarchy , OutTimeHierarchy  and StaffHierarchy  . now i want to get all the staffs who come in between  a particular time(InTime) and goes at a particular time(OutTime).

in sql it is :

expression BETWEEN InTime AND OutTime;

so can anybody tell me hw to get it in MDX.

Thank you.