How do I script a password change for a SQL server login?

Just what the title says, I need to change the password for an existing sql server login and I want to do it via sql script.

From stackoverflow lfoulkrod

• ALTER LOGIN

  http://msdn.microsoft.com/en-us/library/ms189828.aspx

  From Brannon

• http://support.microsoft.com/kb/936492

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