R help - Apr 2002 - plot-history

Hi,
how is it possible that the several
plot devices are not closed, or better how i can use
a plot history. 



normal <- function(x) {
    par(mfrow=c(2,2))
    hist(x)
    boxplot(x)
    sd <- summary(x)[5] - summary(x)[2]
   
plot(density(x,width=2*sd),xlab="x",ylab="",type="l")
    qqnorm(x)
    qqline(x)
    }
    
apply(data,2,normal)
    

thanks for advance
& regards,Christian

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