var urlNO = "buscar_sit_formacion.php?pagina="; 
var http = getXmlHttpObject();

function handleHttpResponse(){
    if (http.readyState == 1){
        document.getElementById('resultado').innerHTML = "Cargando...";
    }
    if (http.readyState == 4){
        results = http.responseText;
        document.getElementById('resultado').innerHTML = results;
    }
}

function sendQuerystring(pagina,tabla){

    http.open("GET", "buscar_" + tabla + ".php?pagina=" + pagina, true);
    http.onreadystatechange = handleHttpResponse;
    http.send(null);
}

function getXmlHttpObject(){
    var xmlhttp;

    /*@cc_on
    @if (@_jscript_version >= 5)
    try{
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e){
    try{
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e){
    xmlhttp = false;
    }
    }
    @else
    xmlhttp = false;
    @end @*/

    if (!xmlhttp && typeof XMLHttpRequest != 'undefined'){
        try{
            xmlhttp = new XMLHttpRequest();
        }
        catch (e){
            xmlhttp = false;
        }
    }
    return xmlhttp;
}