Hide Button / Lock Fields after form is completed

I have created a dynamic form with a "regular" button that submits the completed form via email using the following click event script:

var oDoc = event.target;

oDoc.mailDoc({

bUI: true,

cTo: emailaddress,

cCc: emailaddress,

cSubject: "here",

cMsg: "here"

});

From here, I need to Hide/Lock the 'submit' "regular" button, and lock all editable fields once the form is completed and sent.

The goal is that once the form is filled out and emailed, recipients will have a "read only" report.

I'm using LC Designer 8.0 to create this form.  I also have Acrobat 8 Pro.

Any advice given is greatly appreciated.

Thanks.