Accidental Endless loop on button

After much ado, I have finally gotten the customized submit by email button to work on several forms.  I added to a new form and now I have somehow created an endless loop and I cannot figure out why.  What I did: 

I added a regular button (not the submit by email button).  Under Object/Field I selected Submit.  Under Object/Submit, I selected submit as pdf.  I need to capture signatures on a form that will be audited down the road.

Then I added scripts.  I used java script, run at the client.

Then I added under PreSubmit* the following language:

var strToAddress, strCCAddress, strSubject

//Capture the values from the form fields.

strToAddress = txtToAddress.rawValue;

strCCAddress = txtCCAddress.rawValue;

strSubject = txtSubject.rawValue;

event.target.submitForm({cURL:"mailto:"+ strToAddress + "?cc=" + strCCAddress + "&subject=" + strSubject,cSubmitAs:"PDF",cCharset:"utf-8"});

I checked this with the other forms which are not creating endless submissions and I cannot see that I did anything differently.  Can anyone help????

Sarah