[R] Time Series - Function to fit ARIMA and GARCH components

[jStat]

I'm searching for a function to fit a conditional mean structure (ARIMA) and
a conditional variance structure (GARCH) to a data set for one model.
Particularly, I'm trying to fit an IMA(1,1)+GARCH(1,1) model to a data set. 
However, I can't seem to find a function that will let me specify both the
ARIMA and GARCH components.
Any help would be appreciated!
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