[R] Multiple graph in one graph window

[mrdawoud at abo.fi]

Dear R users;
Could you tell me how to let R create multiple graphs in a graph  
window. Please note that I am talking about creating multiple plots in  
the same page of the graph window. For example:
g1=c(1,2,3)
g2=c(3,1,7)
g3=c(4,2,11)
g4=c(5,5,9)
...
all in one graph window.
Best Regards
Reza