var xmlHttp

function download() { 


      var url="../smarty/SezioneDownload.php"; 
      xmlHttp=GetXmlHttpObject(stateChanged)
      xmlHttp.open("GET", url , true)
      xmlHttp.send(null)
	 

} 

function stateChanged() { 

   if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") { 
      document.getElementById("center_content").innerHTML = xmlHttp.responseText 
   } 

}
 

function GetXmlHttpObject(handler) { 
   
   var objXmlHttp=null
   if (navigator.userAgent.indexOf("Opera")>=0) {
      alert("This example doesn't work in Opera") 
      return 
   }
   if (navigator.userAgent.indexOf("MSIE")>=0) { 
      var strName="Msxml2.XMLHTTP"
      if (navigator.appVersion.indexOf("MSIE 5.5")>=0) {
         strName="Microsoft.XMLHTTP"
      } 
      try { 
         objXmlHttp=new ActiveXObject(strName)
         objXmlHttp.onreadystatechange=handler 
         return objXmlHttp
      } 
      catch(e) { 
         alert("Error. Scripting for ActiveX might be disabled") 
         return 
      } 
   } 
   if (navigator.userAgent.indexOf("Mozilla")>=0) {
      objXmlHttp=new XMLHttpRequest()
      objXmlHttp.onload=handler
      objXmlHttp.onerror=handler 
      return objXmlHttp
   }
}