[Tuxxin]

I'm trying to get an option to where when you click on an html button it will popup and ask you for information (in this case a tracking number). The field will auto have a tracking number there and highlighted, the option is only if they want to change the tracking number.

Below is the code I have and I've tried multiple variations of it but can't get it to do fully what I need.

PHP Code:

<form method="post" action="' . $_SERVER[SCRIPT_NAME] . '" name="picked_up">

<script type="text/javascript">

function show_prompt()

{

var tracknum=prompt("Shipment Tracking Number","' . $row[tracking_num] . '");

if (tracknum!=null && tracknum!="")

  {

        document.write(tracknum);

  }

}                    

</script>

<input onclick="show_prompt()" type="button" name="picked_up" value="Package Received">

</form> 

That code below works correctly but reloads the page and only displays whatever was entered into the prompt box.

How can I get this to submit "tracknum" into a post variable?

Thanks.