"Merging" two Videos with AviSynth

[merlinmage]

Hi guys,
I have two rendered sequences (sequence A and sequence B) and want to put them in one AviSynth script to "merge" them,
so that after I encoded the file, sequence B starts right after sequence A (without any frame inbetween).

My question is,is that really possible to do with AviSynth?

Regards,
merlin

[J_Darnley]

a = SomeSource()
b = SomeSource()
a + b

[merlinmage]

Thanks, you saved my life =)