Movieclips .x position Please Help

Hey guys, what i have is a series of buttons on my screen.
When a button is pressed it adds another movieclip (from the library) to a movieclip acting as a container at the bottom of the screen.

This all works fine, and the movieclip is added to the container (directly in the middle), what i need is it to be positioned to the left. Obviously i could change the .x value, but its a little bit more complicated, because if there is already one movieclip there (in the container at the bottom), the next one that is added needs to be 25 pixels to the right of the movieclip already there. I hope that makes sense? I never seem to get a reply on forums so i hope this time its different :slight_smile:

heres the code i use.

var bass1:Bass1 = new Bass1();


//navigation
help_bt.addEventListener(MouseEvent.MOUSE_UP,help);
function help (event:MouseEvent):void{
    gotoAndStop(21);
}
home_bt.addEventListener(MouseEvent.MOUSE_UP, home);
function home (event:MouseEvent):void{
    gotoAndStop(1);
}


main_bass_bt.addEventListener(MouseEvent.CLICK,BassSounds);

//each seperate sound areas

function BassSounds (e:Event):void{
    
    navHold.addChild(bass1);


}