//function which destroy the cookies
function destroy(name) {
   var today = new Date()
   var expires = new Date()
   expires.setTime(today.getTime() - 1000*60*60*24*2)
   setCookie(name, "", expires)
}

//sets the cookies.
function setCookie(name, value, expire) {
   document.cookie = name + "=" + escape(value)
   + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()))
}

//returns the value of the corresponding cookie.
function getCookie(Name) {
	var search = Name + "="
   if (document.cookie.length > 0) {
      offset = document.cookie.indexOf(search)
      if (offset != -1) {
         offset += search.length
         end = document.cookie.indexOf(";", offset)
         if (end == -1)
            end = document.cookie.length
         return unescape(document.cookie.substring(offset, end))
      }
   }
}

//sets a cookie with an expiry date of 1 year.
function register(name,value) {
   var today = new Date()
   var expires = new Date()
   expires.setTime(today.getTime() + 1000*60*60*24*365)
   setCookie(name, value, expires)
}