Getting variable from movie?

1

frogive me, as i am still learning, and this might sound totally off the wall.

i need to get the filename of the movie that is being played and have it availble to me within a class.

i have a function that gets the name, but it doesnt work inside the class.

how would i get the filename of the movie that is playing from within the class and be able to use it as a variable?

this is the function i have been using to get the filename.

function movieName () 
{
    var url = new String (this._url);
    var p1 = url.lastIndexOf  ("/") + 1;
    var p2 = url.length;
    return url.slice (p1, p2);
}

name = movieName();