The previous advice is bang on. I understand your good intentions, and he's probably a great guy (most alcoholics are very smart and charming) and you don't want him to lose his job.
The problem is, that most alcoholics will not seek help until they have hit bottom. Now that bottom differs from drinker to drinker. For the blessed, it's something minor. For most, they have to lose their job, or their family (divorce, etc.), or their health before they will consider help. Even then, some will never seek help.
The bang on advice you've previously recieved has to do with NOT enabling his behavior. As long as there are no consequences, a drinker will continue to drink. He has to fear losing his job, which if he does he will fear losing his home, then his family. If he's one of the lucky ones, he will get help as soon as he knows his job is on the line. If not, you have to do what is right for your organization and in turn, it is what is right for him in the long run.
The first step of Aloholics Anonymous is -
"We admitted we were powerless over alcohol - that our lives had become unmanageable."
Until that unmanageability becomes a reality in his life (fear of losing his job, or actually losing it) why would he change; he can have his job and drink to.
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Now the above advice is the "don't enable" part it, and it's the most important. However, most of us are compassionate people and want to help in some way.
If you want help in a hands off way, get some AA literature and simply leave it on his desk.
Here is the "Is AA for you?" Pamphlet. It has 12 questions that help you determine whether you are an alcoholic or not. Most drinkers will answer yes to more than one, and all it takes is one for you to examine whether you have a problem with alcohol. The problem is that most drinkers are in denial, and will not see the truth even with the facts in front of them. All you can do is plant the seed. He may never come to you for help, or he may call AA right away, or years from now; at this point you put in God's hands.
Here is the link for the pamphlet:
http://www.aa.org/pdf/products/p-3_isaaforyou.pdf
Alcoholics Anonymous's link is:
Alcoholics Anonymous : (http://www.aa.org)
I found this on another thread and it's worth repeating:
Alcoholics are very smart, many are gifted. Their bodies handle booze in a totally different way than the average person. Not only can they handle large amounts, they are smart enough to lead a functional life in spite of high intake. But alcohol is a liar, who wants you dead, make no mistake about it.
It's a start, hopefully for him it is his start on a journey of recovery.
Good luck and God Bless to both of you.