[BioC] How to get ENTREZID from Gene symbol in bioconductor

[Srinivas Iyyer]

Dear group: 
I have a vector of gene symbols. 
I want to get EntrezID for those gene symbols. 
I want to use hgu133plus2 as my annotation
environment. 

how can I do it. 

here is my vector:

msba <- c('AURKA','CCNB2','TRIP13','EZH2','TYMS')

when I have probesetid it is straightforward for me. 

thanks for your help. 

srini




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