if (document.images){
	var thissite="http://www.rifugiomalghera.it/";
	preload_image_object = new Image();
	image_url = new Array();
	image_url[0] = thissite+"images/tm1_h.gif";
	image_url[1] = thissite+"images/tm2_h.gif";
	image_url[2] = thissite+"images/tm3_h.gif";
	image_url[3] = thissite+"images/tm4_h.gif";
	var i = 0;
	for(i=0; i<=3; i++) {
		preload_image_object.src = image_url[i];
	}
}