[R] how to replace text...

[Jonathan Q.]

if I have....

QQQQ<-priceIts("QQQQ",quote="Close")
QQQQ<-priceIts("QQQQ",quote="Close");plot(QQQQ)

and then i want to do the same thing but say with IBM instead of QQQQ
is there an easy way like replace qqqq/ibm

Thanks in advance./Jonathan