KML updated hourly...problem with cache when loading it

I have searched all over the Internet for a solution to my problem. I
have a kml that is constantly updated...it's a network monitoring, so
we constantly update the kml.
Let's say i open the kml 100 times a day. The function who loads the
kml, instead of showing the fresh one, loads from the cache (I suppose
that theory) an old version.

Assume the following code:
//////////////////////////////////////////////////////////////////////////////////
// Load kml file in ram
function load_kml(kml){
kml = kml + "?"+(new Date()).getDate();
alert(kml);
geoXml = new GGeoXml(kml);
}
load_kml("http://jftremblay.net/google/google.kml");
////////////////////////////////////////////////////////////////////////////////////

Barry Hunter said in another post that if I add a querystring to my
request (in this case a getdate function), a fresh kml will be loaded
but, in this case, even when I push Ctrl+F5 to make a fresh page load,
it doen`t work.

Any idea???

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