function getCookieExpireDate(noDays){
var today = new Date();
var expr = new Date(today.getTime()+noDays*24*60*60*1000);
return  expr.toGMTString();
}
function makeCookie(name, data, noDays){
var cookieStr = name + "="+ data;
if (makeCookie.arguments.length > 2){
  cookieStr += "; expires=" + getCookieExpireDate(noDays);}
document.cookie = cookieStr;
}
function readCookie(cookieName){
 var searchName = cookieName + "=";
 var cookies = document.cookie;
 var start = cookies.indexOf(cookieName);
 if (start == -1){ // cookie not found ;
   return "";
   }
 start += searchName.length //start of the cookie data;
 var end = cookies.indexOf(";", start);
 if (end == -1){
   end = cookies.length;
   }
 return cookies.substring(start, end);
}