Check my if/else statement please?

I am trying to write an ‘if/else’ statement, but, although I now have no errors reported on output, I cannot get this code to work. Basically, I want where the movie clip is positioned on the stage [in this case the _x property] to dictate what ‘tool-tip caption’ mc is displayed. Can anyone tell me if they can see what may be wrong with this code?

if(
	mp3_mc._x<400){
	_root,caption2._visible=false;
	_root.caption1._visible=true;
	_root.caption1.gotoAndPlay(1);
	_root.caption1.words=" Minimise Player";
	startDrag (_root.caption1, true);
	caption1._x = _xmouse;
	caption1._y = _ymouse;
}
else(
	mp3_mc.x_>400)
_root.caption1._visible=false;
_root.caption2._visible=true;
_root.caption2.gotoAndPlay(1);
_root.caption2.words="Maximse Player";
startDrag (_root.caption2, true);
caption2._x = _xmouse;
caption2._y = _ymouse;

}

Many thanks for help or advice

MArll