[R] GLMM plots

[Cristina Gomes]

Hi R-users,
I would like to plot the effects of one of the predictor variables on 
the response variable in the GLMM I ran with the lme4 package. Usually 
when doing a multivariate analysis I would obtain the residuals of the 
model without the predictor variable of interest (x1) and then plot 
these residuals against X1. But in the lme4 package one can not obtain 
residuals. Is there any way of obtaining plots of this sort? or any 
other recommendation somebody could give me regarding this topic?
Thanks a lot in advance.
Cheers,
Cristina.