function load_main_ad() {
	if (typeof banner_food_right=='undefined') banner_food_right = "";
	if (typeof banner_food_left=='undefined') banner_food_left = "";
	$('#banner_food_right').html(banner_food_right);
	$('#banner_food_left').html(banner_food_left);
	$('#banner_food_right').show();
	$('#banner_food_left').show();
}