var req;

var data = "";


function loadXMLDoc(loc) {

var req=null ;
	var url = 'ajaxtest.php?loc='+ loc +' '

 if(window.XMLHttpRequest && !(window.ActiveXObject)) {
	
    	try {
			req = new XMLHttpRequest();
        } catch(e) {
			// req = false;
        }
    // branch for IE/Windows ActiveX version
    } else if(window.ActiveXObject) {
       	try {
        	req = new ActiveXObject("Msxml2.XMLHTTP");
      	} catch(e) {
        	try {
          		req = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch(e) {
          		//req = false;
        	}
		}
    }

	if(req != null) {
		req.onreadystatechange = function() {

    if (req.readyState == 4) {
		
        if (req.status == 200) {
           
			var s=req.responseText;
// window.alert(s);
var tt = document.getElementById("display");
  tt.innerHTML = s;
			// display.innerHTML = s;
			

			 var robotArray = req.responseXML.getElementsByTagName('Number');
			 len = robotArray.length;


        } else {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
        }
    }
}

		try{
		req.open("GET", url, true);
    	req.send(null);

		}catch(e) { window.alert(e);}
	}
}