I am trying to load a file which i assined using a variable

here is my AS:
PHP Code:
file _level0.id;
loadVariables("file.php?id="+file"_root");
myMusic = new Sound(myMusicMc);
myMusic.loadSound("../songuploads/song1.mp3");
//myMusic.loadSound("../root/soundfiles/"+file); 
But it only loads when i explicity say the location

What shall I do?