function showImage(id, pg) {
	var url = 'article_images.php?id=' + id + '&pg=' + pg;
	var win_x = 500;
	var win_y = 350;
	var mid_x = (screen.width - win_x) / 2;
	var mid_y = (screen.height - win_y) / 2 - 50;
	var popup = window.open(url, 'popup', 'left=' + mid_x + ',height=' + win_y + ',scrollbars=1,top=' + mid_y + ',width=' + win_x);
	popup.focus();
}

function validate_mailing(f) {
	var err = new Array();
	
	if (f.email.value == "") {
		err.push("Email is required.");
		highlight(f.email, 1);
	} else if (!is_email(f.email.value)) {
		err.push("Email is not in the correct format.");
		highlight(f.email, 1);
	} else {
		highlight(f.email, 0);
	}
	if (err.length > 0) {
		show_dialog("Mailing List Errors", "The following fields had errors:<ul><li>" + err.join("</li><li>") + "</ul>");
	} else {
		ajax_updater("functions/cb_mailing_list.php", "email=" + f.email.value, "mail_message", "get");
	}
	return false;
}