Help with button

So in my form I have a check box or radio button (doesn't matter which) that when I click if activates the script 
sendmail[from:zoho.loginuseridto:input.Agency_Emailsubject:"Message from Nigel L Cross (Kent)"message:input.Email_Messagecontent type:HTML]
What I want is to have a button within the form that does this instead of using a check box or radio button.
Is this possible please
Thanks.
Nigel
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