function ajax(url)
{
req = null;

if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
req.onreadystatechange = processReqChange;
req.open("GET",url,true);
req.send(null);

} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {

req.onreadystatechange = processReqChange;
req.open("GET",url,true);

req.send();
}
}
}

function processReqChange()
{
if (req.readyState == 1) {
	
//document.getElementById('pagina1').innerHTML = "<p align='center' style='height:400'><br /><br /><br /><br /><img src='img/ajax-loading.gif' border='0'><br /><br />Carregando, por favor aguarde...</p>";
}


else if (req.readyState == 4) {


if (req.status ==200) {
	var retorno = req.responseText;

	banners = retorno.split(";");

	troca_banner();
} else {
alert("Houve um problema ao obter os dados:n" + req.statusText);
}
}
}