How to order an array of arrays by index in javascript

I'm trying to order an array of arrays by it's 2nd index, so if I have something like:

a[0][0] = #
 a[0][1] = $
 a[1][0] = x
 a[1][1] = y
 a[1][2] = z
 a[2][0] = qaz
 a[2][1] = qwerty
 

I get:

a[0][0] = #
 a[1][0] = x
 a[2][0] = qaz
 a[0][1] = $
 a[1][1] = y
 a[2][1] = qwerty
 a[1][2] = z
 

Thanks in advance!!

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