# Global var using in Flash MX
**URL:** https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004
**Category:** Uncategorized
**Created:** [December 2, 2002, 9:36pm UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004 "2002-12-02T21:36:04Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@olegkot](https://forum.kirupa.com/u/olegkot)
#### Post date: [December 2, 2002, 9:36pm UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004/1 "2002-12-02T21:36:04Z")
Hi!
I’m trying to set global var at the main movie timeline in first frame. Than I need to reach and to change this var inside of the sub-mc every time when it plays in loop with main mc.
In details: there is a sub-sub-mc which gets visibility from sub-mc depending on this global var, and also changes this global var. So I need to reach it and change every loop of mc.
Would be very glad to get any suggestions. I tryed many ways - nothing has worked.
oleg. ☹
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [December 2, 2002, 9:40pm UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004/2 "2002-12-02T21:40:07Z")
refer to your variable as \_root.variablename that will target a variable located on the main timeline.
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [December 3, 2002, 9:55am UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004/3 "2002-12-03T09:55:40Z")
Thx!
But how to declare the var?
var a = 0;
\_global.a = 0;
and where?
oleg.
---
### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [December 3, 2002, 2:19pm UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004/4 "2002-12-03T14:19:46Z")
\_root.a = 0;
this would be for a variable named a at the root timeline which is global.
---
### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [December 3, 2002, 4:27pm UTC](https://forum.kirupa.com/t/global-var-using-in-flash-mx/9004/5 "2002-12-03T16:27:20Z")
At least concearning the flash 5 version(don´t now if it changed in FMX):
Global variables are variables that can be set or retrieved at any point anywere. What you are sugesting is just a variable located a the root, then, a _ **local** _ variable located at the root (or main timeline) not global.
Global variables don´t exist on flash they are simulated by this code:
```php
Object.prototype.yourGlobalVariable = value;
```
But it is easier if you refer to a variable to the respective location .
**Example:** You want to set the value of the **pamelaAndersonIsHot** variable located inside the movieclip **foxy** at the main timeline (\_root) to **true** :
```php
_root.foxy.pamelaAndersonIsHot = true;
```
😛
=)