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URGENT: match method

Hi there,

I'm lost in the 'match' method I read and read and read about it but STILL can not figure how to build the argument of the characters to be compared!

I want the text input box to accept only english characters and numbers and a dash, how can I do it? Following is a part from my script:

CompareArgument = /-|[abcdefghijklmnopqrstuvwxyz]|[1234567890]/;

if (TextInput.value.match(CompareArgument))
alert ('OK');
else
alert ('NOT');

Please help.

If you need the full script please tell me

Thanx in advance