R help - Jun 2011 - ggplot 2: Histogram with bell curve?

I am learning ggplot2 commands specifically qplot for the time being and I
have figured out how to create histograms and normal density curves but I am
not sure how to add a normal bell curve or other dist. as well on top of a
histogram. 

Here are the two graphs that I created. 

## Histogram 
t<-rnorm(500) 
w<-qplot(t, main="Normal Random Sample", fill=I("blue"),
colour=I("black"),
geom="histogram") 
w 

##Density Curve 
t<-rnorm(500) 
r<-qplot(t, main="Normal Random Sample",
colour=I("black"), geom="density",
adjust=4) 
r  



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Hi

Don't use t as var names, because t is also a function (transpose).
This code should work...
set.seed(1)
T <- rnorm(500)
qplot(T, geom = "blank") + 
geom_histogram(aes(y = ..density..), colour = "black", fill =
"blue") +
stat_density(geom = "line", colour = "red")



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