LoadMovie(var +".swf")

Hello all. I have question regarding loadMovie and vars. I have a text input with var = “username”. I essentially want a swf to load depending on the text input.

Not sure if this matter but my php has…
$user=$_POST[‘user’];

If i want to load the var = “username” into loadmovie… would i just do this by loadMovie(username+".swf"); ? I want the var username to load the test within the var. For instance… if i type “jason” into my input text which has a var “username”, this would load a mc of “jason.swf”. Please let me know if i am doing something wrong. Or if you have any other ways of doing something like this… Thanks you.