// Define variável global 

var xmlhttp; 
 
function page($value) { 
 
        if (window.XMLHttpRequest) { 
  xmlhttp = new XMLHttpRequest();   
        } else if (window.ActiveXObject) { 
   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");   
        } else { 
  alert("Seu navegador não suporta XMLHttpRequest."); 
  return; 
        } 
 
    xmlhttp.open("POST", "paginas.php", true);  
 
    xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); 
    xmlhttp.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate"); 
    xmlhttp.setRequestHeader("Cache-Control", "post-check=0, pre-check=0"); 
    xmlhttp.setRequestHeader("Pragma", "no-cache"); 
     
        xmlhttp.onreadystatechange = Retorno; 
 
	    xmlhttp.send("page=" + $value); 
} 
 
 
function Retorno() { 
 
        document.getElementById("conteudo").innerHTML = "<center><br/><img src=\"admin/imagens/loading.gif\"> <BR/>Carregando...<br/><br/></center>"; 
    if (xmlhttp.readyState == 4) {       
  if (xmlhttp.status == 200) { 
    document.getElementById("conteudo").innerHTML = xmlhttp.responseText; 

        } 
		else { 
			document.getElementById("conteudo").innerHTML = "<center><br/><img src=\"admin/imagens/error.gif\"><br/>Problemas ao carregar os dados.<br/><b><i>Por favor, tente mais tarde.</i></b><br/></center>"; 
			alert("Problemas ao carregar os dados."); 
        } 
		
    } 
 
}