I would do this as a lattice plot. Continuing with your data:
tmp <- data.frame(sapply(data, tapply, data[1:2], mean))
tmp$time <- factor(tmp$time)
xyplot(thanaa+thalcho+thalino+ponaa+pocho+poino ~ time,
group=BMIakt, data=tmp, type="l", scales=list(relation="free"),
auto.key=list(title="BMIakt", border=TRUE))
Rich
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