You missed that completely.
The value of your image button is 'save' your If is testing for the value of 'Save'.
You logic is working as it should because it is preforming a case senstive evaluation and save <> Save.
Adjust the value in your image button or adjust your code:
<% if ToLower(Request.form("action"))="save" then
response.write("Do something")
End if %>
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