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Create a button hotspot on the form. On a separate line above it , put "<!--" and add a line below it with "//-->" using the HTML paragraph style. This will comment out the Domino button on the browser.
Another way to get rid of the Domino Submit button is to create a hotspot button on the form but do not assign a name or any code to it. It will not appear when you compose the document from a browser.
And for your amusement and all the other variations on this, check out the How To Hide A Submit Button web site :-)
 Notes R3
Notes R3  Notes R4
Notes R4  Notes/Domino 4.5
Notes/Domino 4.5  Notes/Domino 4.6
Notes/Domino 4.6  Notes/Domino R5
Notes/Domino R5