[R] display of a loess fitted surface

[Marta Colombo]

Good morning,
I am Marta Colombo,student at Politecnico,Milan. I am studying local regression models and I am using loess function. My problem is that when I have a loess object I don't know how to display the fitted surface; in fact, while in S when you have a loess object you can see it writing plot(object), in R this dosen't work. Also I'd like to know if there is something like the S function pointwise that computes upper and lower confidence intervals. 
Thank you very much for your attention.
Marta Colombo