https://rishiprasad.org/checkCaptcha.js

1var xmlhttp;
2
3function Captcha(str1)
4{
5	//alert(str1);
6xmlhttp=GetXmlHttpObject();
7if (xmlhttp==null)
8  {
9  alert ("Browser does not support HTTP Request");
10  return;
11  }
12var url="checkCaptcha.php";
13url=url+"?q="+str1;
14url=url+"&sid="+Math.random();
15xmlhttp.onreadystatechange=stateChanged1;
16xmlhttp.open("GET",url,true);
17xmlhttp.send(null);
18}
19
20function stateChanged1()
21{
22if (xmlhttp.readyState==4)
23{
24
25var output1=xmlhttp.responseText;
26if(!(output1==""))
27{
28alert(output1);
29return false;
30}	
31}
32}
33
34function GetXmlHttpObject()
35{
36if (window.XMLHttpRequest)
37  {
38  // code for IE7+, Firefox, Chrome, Opera, Safari
39  return new XMLHttpRequest();
40  }
41if (window.ActiveXObject)
42  {
43  // code for IE6, IE5
44  return new ActiveXObject("Microsoft.XMLHTTP");
45  }
46return null;
47}