loadMovie problem

Hi

Currently I have a line of code which reads…

 a1_flag.loadMovie("image.jpg");

This works perfectly fine but say I have a variable called ‘flag’ and I want to replace what ever is held in ‘flag’ and that would be the file name. So I’d have something like…

 a1_flag.loadMovie('flag' +".jpg");

But I’m not sure how to code it…any suggestions?