I want to load an external swf, using a variable

I think i am screwing up the syntax. let’s say I have a global variable, like…
_global.something = mymovie

And then, the code to load in the external swf…
loadMovie((something)+ “.swf”, _root.ec);
Well, it doesn’t work, and I’m just not sure where to put the quotes, and how many parenthesis are needed.
How do I use a global variable and access it for this loadmovie code?
Thanks.