https://dudus.log.br/js/ajax.js

1// ver o navegador
2function GetXMLHttp() {
3    
4	if(navigator.appName == "Microsoft Internet Explorer") {
5        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
6    }
7    else 
8	{
9        xmlHttp = new XMLHttpRequest();
10    }
11	
12    return xmlHttp;
13}
14
15var xmlRequest = GetXMLHttp();
16
17// verifica se retorno do servidor uma pagina
18function abrirPag(valor) // erro
19{
20	var url = valor;
21
22	xmlRequest.open("GET",url,true);
23	xmlRequest.onreadystatechange = mudancaEstado;
24	xmlRequest.send(null);
25
26	if (xmlRequest.readyState == 1) 
27	{
28		document.getElementById("content").innerHTML = "<img src='loader.gif'>";
29                /*icone carregar pagina*/
30	}
31
32	return url;
33}
34
35function mudancaEstado() // carregado
36{
37	if (xmlRequest.readyState == 4)
38	{
39		document.getElementById("content").innerHTML = xmlRequest.responseText;
40	}
41}
42