[R] use of class variable in r as in Proc means of sas

[premmad]

Hi,everyone i need to calculate quartile values of a variable grouped by the
other variable .
same as in aggregate function(only median,mean or functions is possible-i
think so)
Could you please help me to achieve the  same for other quartile
values(5,10,25,75,90) as for median using aggregate.
Thanks in advance.
data :
zip             price
60000	567000	
60001	478654
60004      485647
60001      2783958
60005      97845848
60006      378383478
60002      397895735
60001      487587575
60002      478848
60003      49847874
60004      467648
60005       567489
60006       4776746
60004       4843949
what i want i quartile values of price grouped by zip
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