[R-sig-ME] interpreting Std. error from glmer output

[Christine Griffiths]

I want to plot my predictions from a model and use the standard error 
output as a measure of dispersion as I am unable to calculate confidence 
intervals with mcmcsamp as I have a binomial distribution.

I know that the estimates are deviations from the intercept.
Fixed effects below:
                           Estimate Std. Error z value Pr(>|z|)
(Intercept)                 2.90836    0.34041   8.544  < 2e-16 ***
treatment2      		   -0.73507    0.12986  -5.660 1.51e-08 ***
treatment3                 -1.20052    0.12371  -9.705  < 2e-16 ***

So the estimate for treatment 2 is 2.9 + -0.73. Are standard errors also 
deviations from the intercept? i.e. 0.34 + 0.13 for treatment 2?

Many thanks
Christine