var xmlhttp;

function armazena(valor){

    xmlhttp=GetXmlHttpObject();
    if (xmlhttp==null){
        alert ("Your browser does not support AJAX!");
        return;
    }

    var url="horarios/carrinho_ajax.php";
    url=url+"?i="+valor;
    xmlhttp.onreadystatechange=stateChanged;
    xmlhttp.open("GET",url,true);
    xmlhttp.send(null);
    return false;
}

function stateChanged(){
    if ( xmlhttp.readyState<4 ){
        document.getElementById('mudaFinal').innerHTML = '&nbsp;';
    }
    if (xmlhttp.readyState==4){
        document.getElementById('mudaFinal').innerHTML = '<a href="horarios_final.php" target="_blank">Finalizar</a>';
    }
}

function GetXmlHttpObject(){
    if (window.XMLHttpRequest){
        // code for IE7+, Firefox, Chrome, Opera, Safari
        return new XMLHttpRequest();
    }
    if (window.ActiveXObject){
        // code for IE6, IE5
        return new ActiveXObject("Microsoft.XMLHTTP");
    }
    return null;
}