// Hide the layer Layer

function ShowHide(id, visibility) {
    obj = document.getElementsByTagName("div");
    obj[id].style.visibility = visibility;
}



// Set up cookies


function SetCookie(cookieName,cookieValue,nDays) {
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString();
}

function ReadCookie(cookieName) {
 var theCookie=""+document.cookie;
 var ind=theCookie.indexOf(cookieName);
 if (ind==-1 || cookieName=="") return ""; 
 var ind1=theCookie.indexOf(';',ind);
 if (ind1==-1) ind1=theCookie.length;
 var cookieValue = (theCookie.substring(ind+cookieName.length+1,ind1))
 if (cookieValue == 1){
   ShowHide('survey', 'hidden');
 }
 else {
   ShowHide('survey', 'visible');
 }
// return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}

function DetectCookie(cookieName) {
  var str = document.cookie
  var strLength = cookieName.length;
  var cookiePos = document.cookie.indexOf(cookieName);
  var cookieExtracted = str.substring(cookiePos,(cookiePos + strLength));
  if (cookieExtracted == cookieName) {
    ShowHide('survey', 'hidden');
  }
  else {
    ShowHide('survey', 'visible');
  }
}