Get current page URL?

[!!!]

I need to tell Flash what page I am currently on and all of its GET variables. Is there something already in vBulletin--a variable--that will print the current page you are on/URL?

If not, I'd like to create a global variable:

PHP Code:

pageurl= $_SERVER['REQUEST_URI']; 


Is there an easy way to install that somewhere in a way that this variable may be used by all templates? Moreover, is there a way to hook it without editing my global.php file? I do not know much about developing hacks myself and hooks, though I hear they are useful