AJAX works in IE but not in Firefox or Chrome - ajax

Question

I'm new to using AJAX and my code works in Internet Explorer but not in Firefox or Chrome.
I do not know what it is exactly what should change in the code ...
// I think that error should be here :-)
function cerrar(div)
{
document.getElementById(div).style.display = 'none';
document.getElementById(div).innerHTML = '';
}
function get_ajax(url,capa,metodo){
var ajax=creaAjax();
var capaContenedora = document.getElementById(capa);
if (metodo.toUpperCase()=='GET'){
ajax.open ('GET', url, true);
ajax.onreadystatechange = function() {
if (ajax.readyState==1){
capaContenedora.innerHTML= "<center><img src=\"imagenes/down.gif\" /><br><font color='000000'><b>Cargando...</b></font></center>";
} else if (ajax.readyState==4){
if(ajax.status==200){
document.getElementById(capa).innerHTML=ajax.responseText;
}else if(ajax.status==404){
capaContenedora.innerHTML = "<CENTER><H2><B>ERROR 404</B></H2>EL ARTISTA NO ESTA</CENTER>";
} else {
capaContenedora.innerHTML = "Error: ".ajax.status;
}
} // ****
}
ajax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
ajax.send(null);
return
}
}
function creaAjax(){
var objetoAjax=false;
try{objetoAjax = new ActiveXObject("Msxml2.XMLHTTP");}
catch(e){try {objetoAjax = new ActiveXObject("Microsoft.XMLHTTP");}
catch (E){objetoAjax = false;}}
if(!objetoAjax && typeof XMLHttpRequest!='undefined') {
objetoAjax = new XMLHttpRequest();} return objetoAjax;
}
//These functions are connected with a form
function resultado(contenido){
var url='ajax/buscar.php?'+ contenido +'';// Vota Resultado
var capa='resultado';
var metodo='get';
get_ajax(url,capa,metodo);
}
function paginas(contenido){
var url='ajax/paginar.php?'+ contenido +'';// Vota Paginas
var capa='paginas';
var metodo='get';
get_ajax(url,capa,metodo);
}

Answer 1

Strongly suggest that you use a lib like jQuery that encapsulates a lot of what you're doing above, masking cross-browser issues (current and future). Even if you don't want to use jQuery site-wide, you could still use it just for its AJAX functionality.