[ns] setdest in a wireless scenario

[<babak@EECS.Berkeley.EDU>]

Hi everybody
I'm trying to run a simple Mobile IP scenario. I try to make my mobile
node to move with this line of code

$ns at 6.000000000000 "$MH setdest 100.0000000000 100.0000000000
2.000000000000" 

but it doesn't work. Does anyone know what the problem could be? Why
doesn't setdest work?

Thanks for your help
Babak