[R] how to delete columns with NA values?

[muting]

Hi everyone:

I have a dataset:

tm1
     col1 col2
[1,]    1   NA
[2,]    1    1
[3,]    2    2
[4,]    1    1
[5,]    2    2
[6,]    1   NA

I need to delete entire column 2 that has NA in it(not all of them are NAs),
and the result I want is

tm1
     col1 
[1,]    1  
[2,]    1    
[3,]    2    
[4,]    1    
[5,]    2    
[6,]    1   

what should I do? 
I search a lot, all I found is how to delete column with all NA values..

Thanks a lot

muting

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