Sending URL parameters without a hyperlink.

I am sending URL parameters between pages like so:

<a href="<?php printf("%s?pageNum_Get1=%d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", $currentPage1, min($totalPages_Get1, $pageNum_Get1 + 1), $queryString_Get1, $townstr, $makestr, $modelstr, $countrystr,$bodystr, $neckstr, $boardstr, $pickupsstr, $memberstr, $postcodestr, $colourstr, $offersstr,$valuestr,$valueconditionstr, $yearstr, $yearconditionstr, $conditionstr, $selectorderstr,$selectascdescstr,$tabstr ); ?>"> Next</a>  

This is the code for a 'Next page' function. which uses a hyperlink,  Next

This works fine.

Now, the problem I have is I want to pass these variables from another page, but NOT using a hyperlink.

For example when the page is exited it run the following code:

     $insertGoTo = "index.php";

     if (isset($_SERVER['QUERY_STRING']))

     {
            $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
            $insertGoTo .= $_SERVER['QUERY_STRING'];

     }

      header(sprintf("Location: %s", $insertGoTo));

How do I add the URL parameters to this code so that the information is passed between the pages?

Thanks

Adam