not able to execute a function in .xslt file by adding additional code

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Javascript

XML

HTML

XSLT

i am working on a implemented project about "ONLINE MOCK TEST" and its designed in html,java script ,and the question file is designed in xml and xslt .
i want to make changes in that file to learn how it is designed but i found an problem while i make any changes in the xslt functions ,only alert box is working ,and if i make any changes to it or add new code its affect the whole project

function fnSubmit(action)
                {

                    for(i=0;i<document.QuizForm.question.length;i++)
                    {
                        if(document.QuizForm.question[i].checked==true)
                        {

                            selectedAnswer=document.QuizForm.question[i].value;
                          break;
                        }

                    }



                    if(action!='SUBMIT')
                    {

                        window.parent.frames[0].save(selectedAnswer, action);
                        document.QuizForm.submit();

                    }
                    else
                    {

                        //window.parent.frames[0].save(selectedAnswer, action);
                        location.href = 'FeedBack.html';

                    }
                }
        function hi()
        {

          for(i=0;i<document.QuizForm.question.length;i++)
                    {
                        if(document.QuizForm.question[i].checked==true)
                        {
                            selectedAnswer=document.QuizForm.question[i].value;


              document.write("ans is : " +selectedAnswer);
              break;
                        }
                    }

        }

this is the sample code where i make changes