i need to delete cookie when browser is closed and already put on window.onbeforeunload along with other as following:

 window.onbeforeunload = function(){

        location.replace(admin.jsp?action=logout);

        deleteCookie('Times');

 }

with setCookie as following:

 function setCookie(name,value,days) {

         var expires;

         if (days) {

                  var date = new Date();

                  date.setTime(date.getTime()+(days*24*60*60*1000));

                  expires = ; expires=+date.toGMTString();

         }

         else {

                  expires = ;

              }

                  document.cookie = name+=+value+expires+; path=/;

     }

when it comes to deleteCookie, it contains as below:

    setCookie(name,value,-1);

The problem is whenever i restart browser, it always comes to window.onbeforeunload so that deleteCookie fired. I actually need this to reset my countdown timer whenever user logs in since the cookie never deleted if the counter doesn't end and user sometimes closes window/tab before it ends. So, my idea is either reset the counter when user logs in or simply delete cookie when user logs out. I still can't figure out how to code this, however. Can anyone help me out? Code snippet will be appreciated, though. CMIIW