Javascript Session Data Storage

Does anyone know of a reliable way to store data to use across pages of a site?... Here is what I've found so far:

1. Cookies - Not enough capacity to store what I need atm.
2. URL hash - Same as above
3. Frames - Not a method I would use atm.
4. HTML 5 document.localStorage and document.sessionStorage - Not fully supported yet
5. Google Gears - The users of the site will most likely not have this installed
6. YUI Storage - This sounds promising... does anyone have experience using it?
7. jStore - This also sounds promising, but when I tried using the demo and reloaded the page, it lost my input. Does anyone have experience with this plugin?

Note: I am not an admin of the site in question, so I don't have database privileges, but I am able to add scripting.

Edit: I found this interesting site that saves session variables in the window.name... it pr开发者_运维技巧obably has some security issues as well

Dojo has a cool plugin that uses flash for a local storage. Plus it abstracts it so if they have gears or an html5 browser it will use that instead

<input type="hidden"

store the value in it, the info comes back from the page together with the info, and after you send it to another page, and so on

Can you use server-sides sessions?