Problems controlling _X bondaries

programming flash
1

For some reason I am able to set the positive _x bondary (1st If) but in the case of the 2nd one it will never execute after the objet _x position is less than 2, any help?:-/

if (_root.nax_mc._x>=450){
  this.nax_mc.clickme_mc.clickme1_txt.text = "the fish is gone, Try again"
  onEnterFrame = null;
  gameOver();

 if (_root.nax_mc._x<2){
  this.nax_mc.clickme_mc.clickme1_txt.text = "2the fish is gone, Try again"
  onEnterFrame = null;
  gameOver();
  }
 }