function prev(n) {
    if (n == 1) {
        location.href = "index.php";
    } else {
        location.href = "page" + n + ".php";
    }
}

function next(n) {
    location.href = "page" + n + ".php";
}

function popUp(url) {
	window.open(url, '', "width=1024, height=768, resizable=yes, toolbar=yes, menubar=yes, scrollbars=yes, location=no");
}