How to make excel file from HTML Form

Hello.
I am working on html form. Where i have to save text field data into excel document format when user click on submit button. I am getting problem of saving in excel file. Please help me if anyone know.
here is my code which i done yet.

HTML:

<h3>

                    Register & WIN</h3>

               <div style="margin-top: 136px;">

                    <div class="row-fluid">

                        <div class="span5" align="right" style="line-height: normal">…

How to make excel file from HTML Form

See original post by mansoor88