function getcookie(name){
	var cookiefound = false;
	var start = 0;
	var end = 0;
	var cookiestring =  document.cookie;
	var i = 0 ;
	// LOOK FOR name IN cookiestring 
	while (i <= cookiestring.length){
		start = i;
		end = start + name.length;
		if (cookiestring.substring(start,end)== name){
			cookiefound = true;
			break;
		}
		i++;
	}
	//CHECK IF NAME WAS FOUND
	if (cookiefound){
		start = end + 1;
		end = cookiestring.indexOf(";",start);
		if (end < start)
		end = cookiestring.length;
		return unescape(cookiestring.substring(start,end));
	}
	//NAME WAS NOT FOUND
	return "NoSubmit";
}

function survey_Validator()
{
var expires = new Date();
var everchecked=false;
expires.setTime(expires.getTime()+2*60*60*1000);
wolsurvey=getcookie("wolSurvey");
for (i=0;i<4;i++)
{if (document.survey.answer[i].checked==true) everchecked=true;}

if ((wolsurvey=="NoSubmit") && (everchecked))
{document.cookie="wolSurvey="+escape("done")+";expires="+expires.toGMTString();
}
else if ((wolsurvey!="NoSubmit")&& (everchecked))
{window.alert("您已经参与过调查！\n为保证调查的客观性，现在您不能再次提交！\n我们将公布最后提交结果。");
for (i=0;i<4;i++)
{document.survey.answer[i].checked=false;
}
}
everchecked=false;
windowOpener("http://www.ok100.net/survey/view.php3");
return (true);
}