PHP - Noob Seeking Help On Data Sending/processing/receiving

This has probably been asked a bunch of times , but :

I only recently started to self learn PHP , and this small project i am making is quite a challange for me.
The scripts below are not realy writen by me , but i wished to tie them together to get a fully working code.

What is suppose to happen is :

In the form i wish to put a special button that puts extra input fields in the form.

After the form is submited ,with whatever amount of feilds in it, the data goes to a processing.php file that sorts all the info gathered and finaly sends all this data formated in to the last file that will be inluded in the index.php.

i already have the code for increcing the amount of inputs but the problem is , all inputs have the same names. Coz of that i get a mess.

What i need is each input to have a unique name or id , that way the processing file would receive different names(id's) with different values(what ever is writen in the inputs by users).

for example:

I have 2 enitial fields displayed on  form.html , i click the button "add new" 5 times and add 5 more input fields.
All this data must be sent to a process.php and on the output write all of this information formated in the last file in a row that will be displayed in the index by useing
<?include("blablabla.php");?>

The input increment is done by a java script. the problem is sending data with unique id(name) and receiving it.

The form file :

<?include("header.php");?>





 <?$i = 1; ?>

   <script type="text/javascript">

   function validate(frm)
   {
        var ele = frm.elements['feedurl[]'];

       if (! ele.length)
        {
            alert(ele.value);
        }

       for(var i=0; i<ele.length; i++)
       {
          alert(ele[i].value);
       }

      return true;
 }

  function add_feed()
 {
      var div1 = document.createElement('div');

     // Get template data
     div1.innerHTML = document.getElementById('newlinktpl').innerHTML;

     // append to our form, so that template data
     //become part of form
     document.getElementById('newlink').appendChild(div1);

 }


   var ct = 1;

   function new_link()
   {
   ct++;
  var div1 = document.createElement('div');
  div1.id = ct;

  // link to delete extended form elements
 var delLink = '<div style="text-align:right;margin-right:65px"><a href="javascript:delIt('+ ct +')">Del</a></div>';

 div1.innerHTML = document.getElementById('newlinktpl').innerHTML + delLink;

document.getElementById('newlink').appendChild(div1);

}
 // function to delete the newly added set of elements
 function delIt(eleId)
 {
d = document;

var ele = d.getElementById(eleId);

var parentEle = d.getElementById('newlink');

parentEle.removeChild(ele);

}
 </script>


<TABLE>
<style>
#newlink {width:600px}
 </style>
    <form action='sendorder.php' method='post'>
        <div id="newlink">
 <div>
<table align="center" border=0>
   <TR><TD><B>Product:</B> </TD><TD><input type=text name=prodname1 value="<?=$_GET['prodname1'];?>">&nbsp;</TD>
        <TD><B>Price:</B> </TD><TD><input type=text name=price1 value="<?=$_GET['price1'].$curency;?>"><b>%</b></TD></TR>
 </table>
 </div>

  </div>


     <p>
        <br>
         <input type="submit" name="submit1">
        <input type="reset" name="reset1">
    </p>

         <p id="addnew"></p>
     <FORM>
<INPUT type="button" value="Add New" name="button2" onClick="javascript:new_link()">
</FORM>

</form>

 <!-- Template -->
 <div id="newlinktpl" style="display:none">
 <div>
 <table border=0>
     <TR><TD><B>Product:</B> </TD><TD><input type=text name=<?$_POST[++$i];?> value="<?$_GET[$i];?>">&nbsp;</TD>
        <TD><B>Price:</B> </TD><TD><input type=text name=<?$_POST [++$i];?> value="<?$_GET[$i].$curency;?>">&nbsp;</TD></TR>

    </form>
</TABLE>

<?include("footer.php");?>



in the code above i tryed to make the programm POST the numbers in the name increcing it by 1. But when i click submit i get offset error.

The processing file :

<?
$timestamp     =     strftime("%d-%m-%Y %H:%M:%S %Y");   // for later use (ignore it)
$i =1;
####################################################################################

if(($_POST['prodname']!="")&&($_POST['price']!="")){

    ############################################################
    $writetocsv = $_POST['prodname1'] . "," . $_POST['price1']"%" <BR> . $_POST[$i] . $_POST[$i];
             $fp = fopen("data/data.csv", "a");
             fwrite ($fp,$writetocsv);
             fclose ($fp);
                            echo "<script>alert('Data sent.')</script>";
}
else{
    echo "<script>alert('Error! Please fill the form!')</script>";
}
echo "<script>location.replace('index.php')</script>";
?>

Perhaps someone knows a easyer way , since i am not sure how to make stuff due to the lack of knowlage in php. I also tryed arrays but , as said before , too tough when you are a noob

Please help.