WoW:API Frame SetScript

Sets the action handler for this frame or removes the handler with a nil function

frame:SetScript("handler", function);

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Arguments:

"handler" is the action to set, i.e. "OnShow" or "OnEvent".
function is the function you want to set for the handler.

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Example 1:

for i = 1, 4 do
	local frame = getglobal("PartyMemberFrame"..i);
	frame:SetScript("OnShow", function() this:Hide(); end);
end

Result:

All party frames will be hidden whenever they're shown.

Example 2:

PartyMemberFrame1:SetScript("OnShow", nil);

Result:

Removes the OnShow handler function of PartyMemberFrame1.