R help - Jan 2006 - (sans objet)

Dear R People:

in the function loess, how can one add the weight of the points which is
contained in the variable "nbtotal"

Data :
Nbtotal	P_alim	H_eau


xyplot(P_alim ~ H_eau, 
	auto.key = list(points = T, lines = F),data = data,
	type = c("p", "smooth"), span=.2,
 	scales = "free", layout = c(1, 1),
	main="",
        xlab="Hauteur d'eau (en m)",
        ylab="taux d'alimentation")


the graph xyplot is not modified if the weights term is added
xyplot(P_alim ~ H_eau, 
	auto.key = list(points = T, lines = F),data = data,
	type = c("p", "smooth"), span=.2,weights=Nb_total,
 	scales = "free", layout = c(1, 1),
	main="",
        xlab="Hauteur d'eau (en m)",
        ylab="taux d'alimentation")


Thanks in advance,

Alain ponsero