function open_loading(page)
{
	//popup_loading = window.open(page, 'loading', 'width=200,height=100,toolbar=false,scrollbars=no');
	PopupCentrer(page, 280, 100, 'toolbar=false,scrollbars=no');
	popup_loading.focus();
}

function PopupCentrer(page,largeur,hauteur,options) {
  var top=(screen.height-hauteur)/2;
  var left=(screen.width-largeur)/2;
  popup_loading = window.open(page,'loading',"top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}