How do I disable the speaker key of my Samsung Sprint phone?

I have a Samsung Sprint buzz with a speaker feature. If I hold down the speakerphone button located on outside of the buzz, I can make calls without flipping open the buzz. The problem is that when I involve the buzz in my pocket, the button gets pushed and it keeps making calls on its own. Besides having to apologize to people, I am getting irritated. Does anyone know if there is a setup option that allows me to disable this button? If not, I am ready to open the buzz up and physically disabling it myself.
Samsung A580. The locking feature does work but when I place it in my pocket and walk around, it gets pressed long enough and starts making calls.

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