function exitSurvey()
{ 
	var result = checkCookie("survey");
	var exitPageLoc = "http://"+location.hostname+"/emailauthentication/exit_survey.shtml";
	if (result == false) 
	{
		setCookie("survey");
		window.open(exitPageLoc,"_blank","height=656,width=740");
	}
}

function checkCookie(cookieName)
{
	var result = null;
	var currentCookie = document.cookie;
	var beginCookie = currentCookie.indexOf(cookieName);
	
	if (beginCookie < 0)
	{	result = false;
	} 
	else
	{	result = true;
	}
	return result;
}

function setCookie(cookieName)
{
	document.cookie=cookieName+ "=" +escape("yes");
}