var url = '/captcha/captcheck.php?code='; 
var captchaOK = 2; // 2 - not yet checked, 1 - correct, 0 - failed 
function getHTTPObject() 
{ 
try { 
req = new XMLHttpRequest(); 
} catch (err1) 
{ try { 
req = new ActiveXObject("Msxml12.XMLHTTP"); 
} catch (err2) 
{ try { 
req = new ActiveXObject("Microsoft.XMLHTTP"); 
} catch (err3) 
{ 
req = false; 
} 
} 
} return req; 
} 
var http = getHTTPObject(); // We create the HTTP Object 
function handleHttpResponse() {
if (http.readyState == 4) { 
captchaOK = http.responseText; 
if(captchaOK != 1) { 
alert('The entered code was not correct. Please try again!'); 
document.frmContact.code.value=''; 
document.frmContact.code.focus(); 
return false; 
} 

submitForm(document.frmContact);
} 
} 
function checkcode(thecode) { 
http.open("GET", url + escape(thecode), true); 
http.onreadystatechange = handleHttpResponse; 
http.send(null); 
} 
function checkform() { 
// First the normal form validation 
if(document.frmContact.code.value=='') { 
alert("Please enter the string from the displayed image!"); 
//alert('Please enter the string from the displayed image'); 
document.frmContact.code.value=''; 
document.frmContact.code.focus(); 
return false; 
} 
// Now the Ajax CAPTCHA validation 
checkcode(document.frmContact.code.value); 
return false; 
}