I can't understand your question.
Your profile shows an iMac and iOS 5.1.
The iMac runs OS X so what version if using the iMac?
If using iOS which is for iPod, iPhone and iPads, what device are you using?
So where are you attempting to do this browsing, your Mac or something else?
Exactky which browser are you using?
What web site isn't working for you, URL?