HELP! problem loading a swf into a container mc

programming flash
1

Hi there
I am having an issue with a site I am working on. Basically I have a “shell” movie that contains the nav bar and an empty container movie clip (“container_1_mc”) that I load and unload external swf movies into.

The problem:

At times the loaded swfs start to play erratically and then the main shell starts to screw up and all sorts of mayhem ensues:

This is the code I am using on one of the buttons:

_root.photos_btn.onRelease = function() {
stopAllSounds();

// moves the current loaded swf off screen to the left

var tween_handler:Tween = new Tween(contain_1_mc, "_x", Bounce.easeOut, 0, -1000, 50, false);
tween_handler.onMotionFinished = function() {

// loads a new swf into the continer_mc

	_root.contain_1_mc.loadMovie("photos.swf");

// moves the newly loaded container_mc onto the screen from the right
	new Tween(contain_1_mc, "_x", Bounce.easeOut, 1000, 0, 20, false);

};

Can anyone figure this out or at least point me in the right direction? Any help would be great

Many thanks

-A