We beat Lithuania 2-1 away in 1997 when they were ranked 42nd and we were 55th. The home leg was a 0-0 draw a month earlier
A year later we beat Croatia 2-0, but lost the away leg 1-0
We beat Yugoslavia 2-1 in September 1999, but had already lost the away leg 1-0
In September 2001 (lots of September wins!) we beat the Netherlands 1-0 but had drawn the away game 2-2
Finally, in March 2007 we beat Slovakia 1-0, but drew the away game 2-2
so, based on FIFA rankings , we've never done the double over a higher ranked side in qualification
FWIW, Austria are currently ranked 35th, we're 26th - http://www.fifa.com/fifa-world-ranki...men/index.html