cross-classified models

I was wondering if the lme4 package can handle so called cross-classified
models. Let's say the hypothetical data set up is the following:

Level 1: observations/data at time 0,1,2
Level 2: students cross-classified by teachers (student has a different
teacher in each observation, 0,1,2). HLM 7 program follows the convention
of a row-by-column cross classification.

Would anyone hint to what the syntax in lme4 would look like (assuming
random-intercept model, no covariates/null model).

Peter

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