Handing over variables between levels

Hi all,

there is the main SWF which loads and external SWF.
On the external SWF through XML I post a variable on _level0 like this:

_level0.selection = arg;

the “arg” is another external SWF, trace works fine. Then I`m trying to load this SWF that is defined by the “arg” (_level0.selection) into a container.

This:
_level0.containerMC.loadPic(3);

works, this:
_level0.containerMC.loadPic(arg);
or
_level0.containerMC.loadPic(_level0.selection);

won`t.

can you tell me why?

thanx,
m.