how to sort two dimensional array ??

[Robert Somerville]

Hi;
 i am having trouble trying to sort the rows of a 2 dimensional array by 
the values in the first column .. does anybody know how or have an 
example of how to do this ??? while leaving the remain columns remain 
relative to the leading column

from numpy import *

a=array( [ [4, 4, 3], [4, 5, 2],  [3, 1, 1] ] )

i would like to generate the output (or get the output ...)

b = [ [3,1,1], [4,4,3], [4,5,2] ]



thanks;
bob