Dynamic loading KML files on the same FlexMap without to refresh the page

I found a way but not 100% happy with it because the map is reloading each time I change the KML with a flashing gray screen.
Here you are the JS code:

<script>
function mapRedraw(idmap,url) {
	var f = new FlexibleMap();
	f.dblclickZoom=false;
	f.scrollwheel=true;
	f.mapTypeControl=false;
	f.showKML(idmap, "<?php echo $base; ?>" + url + "?v=2");
}

jQuery(window).ready(function() {
   jQuery(".map-link").click( function(e){
	e.preventDefault();
	var kml_link = jQuery(this).data("url");
	var kml_map = jQuery(this).data("map");
	var kml_type = jQuery(this).data("type");
        if(kml_type == undefined) kml_type="kml";
	var kml_lang = "_" + jQuery(this).data("lang");
	if(kml_lang == '_undefined') kml_lang="<?php echo $locale; ?>";

	var link = kml_link + kml_lang + "." + kml_type;
	 mapRedraw(kml_map,link);

   });
});
</script>

Any idea to do the same without reloading the map and avoiding each time the flashing gray screen on the map area ?

Cheers,
—
Ben