var interval = 0.25; // casovy interval (v minutach)

    // nacti (AJAX)
    function changeText() { 
        request = new Ajax.Request('/ajax-slide.php', {method: 'get', parameters: 'in_web=1', onComplete: writeText}) 
        setTimeout('changeText()', interval * 1000 * 60); // milisekundy -> sekundy -> minuty
        return; 
    } 
    // vypis
    function writeText(transport) { 
        var text = transport.responseText; 
        document.getElementById('ajax-slide').innerHTML = text; 
        return; 
    }