var array = JSON.parse("your json string here");
//use your elements
var obj1 = array[0];
//
// WRITE YOUR CODE HERE
//

if(!this.JSON) // check for non-existence of JSON object/functions
{
//<define a JSON object>
//from https://github.com/douglascrockford/JSON-js/blob/master/json2.js
//download the file and append the contents here
//run the code as usual
}
//some code accessing json

//get the json.. lets say that is stored in a obj
var obj = JSON.Parse("string that you receive");
var uid = obj.response[0].uid;
var firstName = obj.response[0].first_name;
var lastName = obj.response[0].last_name;
var avatar = obj.response[0].photo_200;

$request = 'http://api.vkontakte.ru/method/users.get?uids=ID&fields=photo_200,status';
$response = file_get_contents($request);
$info = array_shift(json_decode($response)->response);

var_dump($info->photo_200); // URL photo
var_dump($info->status);    // status

function file_get_contents_async( url ,callback) {
var req = null;
 try { req = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {
 try { req = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {
 try { req = new XMLHttpRequest(); } catch(e) {}
 }
 }
 if (req == null) throw new Error('XMLHttpRequest not supported');

req.open("GET",url,true);
req.onreadystatechange=function() {
 if (req.readyState==4) {
 var response = req.responseText;
 callback(response);
 }};
req.send(null);
}


file_get_contents_async('http://api.vkontakte.ru/method/users.get?uids=1&fields=photo_200',function(response) {


 //get the json.. lets say that is stored in a obj
 //response is the downloaded string...
 //BE WARNED THAT : if download fails no call is made
 alert(response);
var obj = JSON.Parse(response);;
var uid = obj.response[0].uid;
var firstName = obj.response[0].first_name;
var lastName = obj.response[0].last_name;
var avatar = obj.response[0].photo_200;
alert(lastName);
 });

  function file_get_contents_async( url ,callback) {
var req = null;
 try { req = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {
 try { req = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {
 try { req = new XMLHttpRequest(); } catch(e) {}
 }
 }
 if (req == null) throw new Error('XMLHttpRequest not supported');

req.open("GET",url,true);
req.onreadystatechange=function() {
 if (req.readyState==4) {
 var response = req.responseText;
 callback(response);
 }};
req.send(null);
}

function text1OnClick(Sender)
{


file_get_contents_async('http://api.vkontakte.ru/method/users.get?uids=1&fields=photo_200',function(response) {


 //get the json.. lets say that is stored in a obj
 //response is the downloaded string...
 //BE WARNED THAT : if download fails no call is made
 alert(response);
var obj = (response);
var uid = obj.response[0].uid;
var firstName = obj.response[0].first_name;
var lastName = obj.response[0].last_name;
var avatar = obj.response[0].photo_200;
alert(lastName);
 });

}

  function file_get_contents_async( url ,callback) {
var req = null;
 try { req = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {
 try { req = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {
 try { req = new XMLHttpRequest(); } catch(e) {}
 }
 }
 if (req == null) throw new Error('XMLHttpRequest not supported');

req.open("GET",url,true);
req.onreadystatechange=function() {
 if (req.readyState==4) {
 var response = req.responseText;
 callback(response);
 }};
req.send(null);
}

function text1OnClick(Sender)
{


file_get_contents_async('http://api.vkontakte.ru/method/users.get?uids=1&fields=photo_200',function(response) {


 //get the json.. lets say that is stored in a obj
 //response is the downloaded string...
 //BE WARNED THAT : if download fails no call is made
 alert(response);
var obj = JSON.parse(response);
var uid = obj.response[0].uid;
var firstName = obj.response[0].first_name;
var lastName = obj.response[0].last_name;
var avatar = obj.response[0].photo_200;
alert(lastName);
 });

}