function refresh(mediaKey, mediaId, ownerId)
{
	/*Versenden der Nachricht*/
	var webRequest = new Sys.Net.WebRequest();
	webRequest.set_url("refresh.php");
	webRequest.set_httpVerb("Post");
	var body = "mKey=" + mediaKey +"&mId=" + mediaId + "&ownerId=" + ownerId;
	webRequest.set_body(body);
	webRequest.get_headers()["Content-Length"] = body.length;
	webRequest.invoke();	
}