xmlhttp = createXmlHttpRequestObject() ;
mostra();






function createXmlHttpRequestObject() 
{
  
  var xmlHttp;
 
  
  try
  {
    // try to create XMLHttpRequest object
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    // assume IE6 or older
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  
  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}


function mostra()
{
	qs = "pagina=" + pagina;
	if((xmlhttp.readyState == 4) || (xmlhttp.readyState == 0))
	{
		
		
		xmlhttp.open("GET","visite/incvisite.php?" + qs,true);
		xmlhttp.onreadystatechange=handlexml;
		xmlhttp.send(null);
		
	}

}

function handlexml()
{
	if (xmlhttp.readyState == 4)
	{
		
		if(xmlhttp.status == 200)
		{
			document.getElementById("visite").innerHTML = xmlhttp.responseText;
			setTimeout('mostra()',300000);
		}
			
	}
}