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 + "; path=/"
      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)
     }