Problems w/ passing variable from one swf to another swf... help, pls

Hi there.
I have a quite simple problem, i guess.
For some reason, i guess memory problem (mine, not the computer memory)
i forgot how to pass variables from one swf to another swf.
Here is the code for the m_2.swf


_global.m_var = "10";

Here is the code for the m_1.swf


mc_load_m.loadMovie("m_2.swf");
m_lvar.text = mc_load_m.m_var;

In the m_1.swf i have a mc called mc_load_m where i am trying to load the movie (m_2.swf) and a text area, dinamic, where i am trying to display the value _global.m_var from the m_2.swf
But it just shows UNDEFINED in the m_1.swf.
What is wrong with the code?
Anyone?
Thanks.
Leo.