Wzar - are you using either PHP or ASP for you pages? We need to know this so that we can point out suitable code for the cookies.
Also, instead of the refresh technique -
try this. That should prevent the page from being cached by the user (cached means stored in the user's temporary internet files). So whenever they visit the page, they get the latest info.
That said though, if the page is dynamically created (PHP/ASP/JSP) then I don't think you should be having any refresh troubles like this.