como saber que o Servidor onde o XML esta , nao manda mais dados

[%=Rodrigo % 0]

Como Faço para saber quando nao esta mais chegando os DADOS XML ?

 

Codigo

 

<script type="text/javascript" language="javascript">var http_request = false;var i=0;function makeRequest(url) {http_request = false;if (window.XMLHttpRequest) { // Mozilla, Safari,...   http_request = new XMLHttpRequest();   if (http_request.overrideMimeType) {	 http_request.overrideMimeType('text/xml');	 // See note below about this line   }} else if (window.ActiveXObject) { // IE   try {	 http_request = new ActiveXObject("Msxml2.XMLHTTP");   } catch (e) {	 try {http_request = new ActiveXObject("Microsoft.XMLHTTP");	 } catch (e) {}   }}if (!http_request) {   alert('Giving up :( Cannot create an XMLHTTP instance');   return false;}http_request.onreadystatechange = alertContents;http_request.ZXXXX = trataerros;http_request.open('GET', url, true);http_request.send(null);}function puxa_xml() {  makeRequest('get.php');}var cnt = 1;function trataerros() {  alert('opa');}function alertContents() {  document.getElementById("evento").innerHTML=(http_request.readyState) + ' - ' + http_request.status;  if (http_request.readyState == 4) {	  if (http_request.status == 200) {	// alert(http_request.responseText);	var xmldoc = http_request.responseXML;	var root_node = xmldoc.getElementsByTagName('linha').item(i);		// alert(root_node.firstChild.data);	document.getElementById('teste').innerHTML = cnt + ' ' + (root_node.firstChild.data);	 // document.getElementById('teste_2').innerHTML = (root_node.firstChild.data);	cnt = cnt + 1;	puxa_xml();	i++;	if (i==3){	  i=0;	}	  } else {	alert('There was a problem with the request.');   }  }  }</script><spanstyle="cursor: pointer; text-decoration: underline"onclick="puxa_xml()">Make a request</span><table border="1"><tr><td><div id='teste'>CallBOX</div></td><td><div id='evento'>CallBOX 2</div></td></tr></table>

[Fabio Morikawa 0]

de mais detalhes....