First of all, you can download Safari for Windows - it seems to be have just the same as Safari for Macs, and means that you can check behaviour of your site with Safari. I suggest that you should...
If you have an index page such as http://www.myweb.com/news/index.html you may reach it by the url http://www.myweb.com/news - (assuming index.html has been set up as your default file for a url).
The alternative to using AJAX would to run a session server side - but you would be loading a new page each time - not really a problem these days. There may be some accessibility issues running...
Brings into question whether you should use HTML5 elements, except for pages specifically designed for iApple things. Fact is that IE still holds a significant amount of the browser market. Of...