function readCookie(cookieName) {
cookieArray = document.cookie.split(';');
for(i=0;i < cookieArray.length;i++) {
  currentCookie = cookieArray[i];
  while (currentCookie.charAt(0)==' ')
	  currentCookie = currentCookie.substring(1,currentCookie.length);
  if (currentCookie.indexOf(cookieName) == 0)
	  return currentCookie.substring(cookieName.length+1,currentCookie.length);
}
return null;
}

function createCookie(cookieValue,cookieDays) {
date = new Date();
var cookieDaysNum = parseFloat(cookieDays);
var milliseconddelay = cookieDaysNum * 24 * 60 * 60 * 1000;
date.setTime(date.getTime()+milliseconddelay);
var expires = "; expires="+date.toGMTString();
document.cookie = cookieValue+expires+"; path=/";
}