Back button disable for First Time Loading of page

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Mobile

jQuery

I working on mobile WAP for which i Have selected Jquery mobile framework. I very new to this framework means this is my first project on this. I need some help on this topic. I want to have back button . to achieve this i have used mark up like this
Back
and this working fine. But i want this button should not appear on my page as this is very first time request. But for the further request it should apear on the page
so that user can navigate back. Let me tell you i have only one page for my application as this is very small study project. Guys please help me out on this. i want to learn it. for my spelling mistake i apologize in advance .