var xmlHttp;

function checkCaptcha(value)
{
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ('Browser does not support HTTP Request');
		return;
	}
	var url='/functions.php?task=check_captcha&id='+value;
	xmlHttp.onreadystatechange=stateChangedCheckCaptcha;
	xmlHttp.open('GET',url,true);
	xmlHttp.send(null);
}

function stateChangedCheckCaptcha()
{
	if (xmlHttp.readyState==4 || xmlHttp.readyState=='complete')
	{
		if(xmlHttp.responseText == "1")
			document.contactform.captcha_ok.value = "1";
		else
			document.contactform.captcha_ok.value = "";
	}
}

function GetXmlHttpObject()
{
	var objXMLHttp=null;
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject('Microsoft.XMLHTTP');
	}
	return objXMLHttp;
}