// JavaScript Document

var xmlHttp

function showHint(str)
{ 
if (str.length > 0)
{ 
var url="captcha.php?sid=" + Math.random() + "&q=" + str
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
document.getElementById("img").style.visibility="visible";
document.getElementById("msg").style.visibility="visible";
document.getElementById("txtHint").innerHTML="";
document.getElementById("msg").innerHTML="Wait validating your code.....";
document.getElementById("button").disabled=true
} 
else
{ 
document.getElementById("txtHint").innerHTML=""
document.getElementById("button").disabled=false
} 
} 
//////////////////state change
function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById("img").style.visibility="hidden";
document.getElementById("msg").style.visibility="hidden";
document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
//alert(document.getElementById("txtHint").innerHTML);
if(document.getElementById("txtHint").innerHTML=="")
{
document.getElementById("button").disabled=false
}
else
{
document.getElementById("button").disabled=true
}
} 
} 
////////get the xml http request
function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't work in Opera") 
return 
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
} 
try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
}