How to get a enemy to flip at a certain point

I'm making a 2D side scroller game and I have this one bit where you have to jump across this lake on lily pads and there are sharks in the water. All you can see is their fins, I have got them moving back and forth but it looks like their swimming backwards, so how to I get the object to flip around? I haven't got any script for this, but here is my script for moving the object and the script for my player to flip just in case there's something I could change in them to make this work: (both JavaScript) ObjectMover:

 #pragma strict
 
 private var Xpos : float;
 private var Ypos : float;
 private var max : boolean;
 
 var Vert : boolean;
 var maxAmount : int;
 var step : float;
 
 function Start () {
     Xpos = transform.position.x;
     Ypos = transform.position.y;
 }
 
 function Update () {
     //SET THE MAX
     if(Vert){ //Vertical
         if(transform.position.y >= Ypos + maxAmount){
             max = true;
         }else if(transform.position.y <= Ypos){
             max = false;
         }
     } else { //Horizontal
             if(transform.position.x >= Xpos + maxAmount){
             max = true;
         }else if(transform.position.x <= Xpos){
             max = false;
         }
     }
 
 
     //MOVING THE PLATFORM
     if(Vert){ //Vertical movement
         if(!max){
             transform.position.y += step;
         }else {
             transform.position.y -= step;
         }
     } else { //Horizontal movement
         if(!max){
             transform.position.x += step;
         }else {
             transform.position.x -= step;
         }
     }    
 }

TextureFlip (this is what I used for my player):

 #pragma strict
 
 var X : float;
 
 function Start () {
     //Gathering normal object scale
     X = transform.localScale.x;
 }
 
 function Update () {
     if(Input.GetKey("a")){ //Gamer pushes left arrow key
         //Set texture to normal position.
         transform.localScale.x = -X;
     }else if(Input.GetKey("d")){ //Push right arrow
         //Flip the texture
         transform.localScale.x = X;
     }
 }