How do I disable all fields when sending a pdf through the "submit a form" button?

This is the code that I'm using...bear in mind that this is my first time to ever ever LOOK at Javascript, so I know it's pretty piecemeal Thank you again.

var emptyFields = [];

for (var i=0; i<this.numFields; i++) {

     var f= this.getField(this.getNthFieldName(i));

     if (f.type!="button" && f.required ) {

          if ((f.type=="text" && f.value=="") || (f.type=="checkbox" && f.value=="Off")) emptyFields.push(f.name);

     }

}

if (emptyFields.length>0) {

     app.alert("Error! You must fill in the following fields:\n" + emptyFields.join("\n"));

}

else

// The text in a Question Alert Box is usually in two parts.  A short explaination

// and the actual question.  It's a good practice to separate the question from the

// explaination by a line, In the text below, this separation is accomplished

// with the escaped line feed characters "\n\n"

//

// The alert box will only show about 6 lines of text, so both explainations and

// text should be kept short

var cMsg = "Have you confirmed that all fields are complete and accurate?";

cMsg += "\n\n Form will lock upon sending.";

var nRtn = app.alert(cMsg,2,2,"Question Alert Box");

if(nRtn == 4)

{// A yes Response

  // Code for doing the thing you do on a yes

  console.println("The Response Was Yes");

var answer = app.alert("Are you sure you're ready to submit Production Form for quote? ", 2, 2);  

/* Question icon, Yes/No button. */

/* 0 = error, 1 = OK, 2 = Cancel, 3 = No, 4 = Submit Form */

{

}

if (answer == 3)

{

}

if (answer == 4)

{

    for (var i=0; i<this.numFields; i++) {  

         var f = this.getField(this.getNthFieldName(i));  

          if (f.type != "button") {  

              f.readonly = true;  

         } 

         else {

              f.display = display.hidden;

         }

    }  }

var Subject_Line = getField("New Construction Door Production Form").value

var Subject_Line2 = getField("Customer Name").value

    this.mailDoc({

        cTo: "mailto:user@domain.com",

        cSubject: Subject_Line+"_"+Subject_Line2,

         cMsg: "Quote requested: New Construction Exterior Door. Thank you!"

    });

}

else if(nRtn == 3)

{ // No Response

  console.println("The Response Was No");

}

else 

{ //Unknown Response

  console.println("The Response Was somthing other than Yes/No: " + nRtn);

}