title: javascript variables in another html page
body: <p>Especially I must indicate that I just have been started to developing javascript applications. my problem is that;
  I have an html page what includes my map. for example(a.html). Also i have javascript variable inside in this page it is (var map)
  My real problem is that i have another html page (b.html) and it includes an iframe which includes a.html. But i need to access my variable (var map) from b.html.
  How can I achieve it? is it possible? if it is not how can I solve this problem?</p>
  
  <p>thanx...</p>