Maybe he has refreshed your page too many
But here's how I re-created it in Firefox:
a) Browse to your site.
b) Right click anywhere inside the page content to open a context menu, and select 'View Page Info'
c) Click the 'Security
' tab on this 'Page Info
d) Click on the 'View Cookies
' button to open 'Cookies
e) Now I think this popup specific cookie has name 'lanapopup
', so select this cookie, and click the 'Remove Cookie
f) Done with the 'Page Info' and 'Cookies' windows. Close them all.
g) Now try press <F5> on your keyboard, and... can you see it now?
Where is the information about this cookie? I'm can't understand JS, but I suppose there should be written cookie somwhere in the code?