var xmlHttp;
var captchaForm;

function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
	{
	  // code for IE7+, Firefox, Chrome, Opera, Safari
	  	return new XMLHttpRequest();
	}
	if (window.ActiveXObject)
	{
	  // code for IE6, IE5
	  //return new ActiveXObject("Microsoft.XMLHTTP");
		return new ActiveXObject("Msxml2.XMLHttp");
	}
	return null;
}

function validateCaptcha(theForm) {

	var captchacode=document.getElementById("captchacode").value;
	
	captchaForm = theForm;
	
	xmlHttp=GetXmlHttpObject();

	var url="validate.asp";	
	var params="captchacode=" + captchacode;
	xmlHttp.open("POST", url, true);
	xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlHttp.setRequestHeader("Content-length", params.length);
	xmlHttp.setRequestHeader("Connection", "close");
	xmlHttp.onreadystatechange=stateChanged; 
	xmlHttp.send(params);	
	
}

///////////////////////////      state changed
function stateChanged()
{
	if (xmlHttp.readyState==4)
	{
		if (xmlHttp.responseText == "1") {
			//alert("Success");
			captchaForm .submit();
		}
		else {
			RefreshImage('imgCaptcha');
			alert("Image Verification failed");
		}
		//alert(xmlHttp.responseText);
		//document.getElementById("cal1").innerHTML=xmlHttp.responseText;
	}
}

function RefreshImage(valImageId) {
	var objImage = document.images[valImageId];
	if (objImage == undefined) {
		return;
	}
	var now = new Date();
	objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
}