function changePage(url) {
    var params = 'url=' + url;
    new Ajax.Request(url, {
                         method: 'get',
                         onComplete: end
                     });
    return false;
}

function end(req) {
    var text = req.responseText;
    if (navigator.appVersion.indexOf( "KHTML" ) > -1) {
        var esc = escape(text);
        if (esc.indexOf("%u") < 0 && esc.indexOf("%") > -1) {
            text = decodeURIComponent( esc );
        }
    }
    text = text.substring(text.indexOf('<!-- AjaxStart -->'),text.indexOf('<!-- AjaxEnd -->'));
    $('content').innerHTML = text;
}