[jQuery] Having a problems with $.post() and external .js files

[m...@polyvisual.co.uk]

Hi all,

Can someone help? I'm having a problem with $.post() and including
external .js files.

I include my jquery in the header of each page:

<script type="text/javascript" src="includes/common.js"></script>

I have a php file which includes a form [an external php file called
searchformbox.php]. Each time a <select><option> is changed in the
form, jquery handles the submit by doing a $.post() and sending all
the form variables back to searchformbox.php. The searchformbox.php
with the new form options is reloaded its <div> by using .html()

What I have found, is that if I don't re-include the external .js file
in searchformbox.php, the jquery does not trigger the second time a
<select><option> is changed.

The answer [it seems] is to re-include the external .js file in
searchformbox.php. However, this causes the jquery to be triggered
twice (obviously causing twice the number of mysql queries and a GET
to reload the common.js file).

I [think I] understand why the jquery is triggered twice, but I can't
understand how to stop it. It seems like a catch 22 problem... can
anyone help?

Thanks :)

Here's the jquery I use for the form resubmit [each <select> has the
class .selector]:

$(".selector").change(function(){

       $("#loadingbox").show();


       var brand = $('#brand').val()
       var oldbrand = $('#oldbrand').val()
       var model = $('#model').val()
       var freegift = $('#freegift').val()
       var minutes = $('#minutes').val()
       var texts = $('#texts').val()
       var contractlength = $('#contractlength').val()
       var price = $('#price').val()
       var phoneprice = $('#phoneprice').val()

       var selectednetworks = [];
            $('@name=network:checked').each(function() {
              selectednetworks.push($(this).val());
            });

       $.post("searchformbox.php", {
'selectednetworks[]':selectednetworks, phoneprice: phoneprice, price:
price, brand: brand, model: model, freegift: freegift, minutes:
minutes,
texts: texts, contractlength: contractlength, oldbrand: oldbrand },

       function(data){
               $("#searchbox").html(data);
       }
);

});