Ecma Script

Hi,

How to fetch"user information list"[Hidden list in SharePoint to store user profile,peoples & groups information]based on group using Ecma script?

I have a Ecma script,this script is used to fetch user information list using camel query,But in camel query i am unable to fetch peoples information based on group............

Please suggest me any methods..........

for example:

SharePoint is a group

        These group have 3 members Test1,test2, Test3

I need to fetch these three members based on group..........

Srinivas