[R] McDonald's omega calculation. How to???

[spats at pe.uth.gr]

hi people,
I am a newbie to R and I would appreciate it very much if someone can help me. I
am used to use SPSS so I don’t have experience with writing a script. I have a
questionnaire (questions 1-12) and I would like to use the omega reliability.
Question 1-8 is factor 1 and question 9-12 factor 2. How can I write the
scripit? Can someone help me???
Thanks in advance
Asterios