// For IE and Firefox
var isCookieEnabled=(navigator.cookieEnabled)? true : false;
//If not IE nor Firefox
if (typeof navigator.cookieEnabled=="undefined" && !isCookieEnabled)
{ 
    document.cookie="COOK";
    isCookieEnabled=(document.cookie.indexOf("COOK")!=-1)? true : false;
}
if (!isCookieEnabled)
{
    window.location.href="check_cookie.aspx";
}
//do whatever