>  And is there any method where we can do a getNumRoute
> = 2 ? i want to display other possible routes suggested by google .

No.
GDrections returns only the "best" route - in its opinion.

As google.maps.com now offers alternative routes, you could lodge an
enhancement request for GDirections to have similar behaviour
   http://code.google.com/p/gmaps-api-issues/issues/list

If you know one or more points on the alternative route you are
looking for, you could run GDirections again using it as a waypoint.

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