POST data to the same page (not through URL)

Am a newbie, a hardcore one.

I am in a need of reloading page with passing variables; so when the page is reloaded it would already have those variables before initializing some of the elements (as u can guess, those variables will be used there).

I need this because I am working with an old videoplayer, which can't be reset on-the-fly, the whole page has to be reloaded to re-initialize it with new params.

Also these variables cannot be passed through url, because they are too long.

I would be glad to see any help and to answer clarifying questions as well. Thanks!