[jQuery] Point of loading the google maps api file

[jQuery] Point of loading the google maps api file


Hi,
sorry, I may blind...
<span id="gmap" style="display:none">
<script src="http://maps.google.com/maps?file=api&v=2&key=........
.... stuff to load the map details....
</span>
<a class="plainPopup" href="#gmap">show map</a>
When I load the page, the google api file is also loading, even I
don't need it.
I would like to load it only, if the user has clicked the map link to
open the map.
How can I do this?
My jquery file looks like this:
$(document).ready(function() {
    $('.plainPopup').click(function() {
..... how can I add here the inlcude of the api file?
Thanks for help!!!
Bye
Heidi