How to set GUI.Button as controls?

I tried several ways, but I always end up with one error. I wan the GUI buttons to do the same thing as the Keys I have set for movement and attack. I have KeyCode.F for attack I want a GUI.Button to do the same thing. I tried to make a GUI.RepeatButton for my KeyCode.A and D for left and right, but that doesn't work either. Here's what I have:

 using UnityEngine;
 using System.Collections;
 using SpriteFactory;
     
 public class player : MonoBehaviour {
     
     public float speed = 1.0f;
         
     private Transform thisTransform;
     private Sprite sprite;
     private bool flipped;
 
     // Use this for initialization
     void Awake () {
         thisTransform = transform;
         sprite = (Sprite)GetComponent(typeof(Sprite));
     
     }
     
     // Update is called once per frame
     void Update () {
         Vector3 moveVector = new Vector3(0,0,0);
         bool moving = false;
         
         
         
             
         
         if(Input.GetKey(KeyCode.A)){
             moveVector.x -= 1.0f;
             moving = true;
     }
         
         if(Input.GetKey(KeyCode.D)){
             moveVector.x += 1.0f;
             moving = true;
             
         }
         
         if(Input.GetKey(KeyCode.F)){
             Attack();
         } else {
             if(!IsAttacking()) {
                 if(moving) {
                     Move(moveVector);
                 } else
                     Stand();
             }
         }
     }
     
     private void Stand() {
         sprite.Stop();
     }
     
     private void Move(Vector3 moveVector) {
         FlipSprite(moveVector.x);
         moveVector *= speed * Time.deltaTime;
         thisTransform.position = thisTransform.position + moveVector;
         sprite.Play("walk");
     }
     
     private void FlipSprite(float x) {
         if(x == 0.0f) return;
         
         float xDir = Mathf.Sign(x);
         if(!flipped && xDir < 0.0f) {
             flipped = true;
             sprite.SetFlippedState(true, false);
         } else if(flipped&& xDir > 0.0f) {
             flipped = false;
               sprite.SetFlippedState(false, false);
         }
     }
     
     private void Attack() {
         if(IsAttacking()) return;
         
         sprite.Play("Sword");
     }
     
     private bool IsAttacking() {
         if(sprite.IsAnimationPlaying("Sword")) return false;
         return false;
     
 }
     void OnGUI () {
         Vector3 moveVector = new Vector3(0,0,0);
         bool moving = false;
     
 
         // Make the first button. If it is pressed, Application.Loadlevel (1) will be executed
         if(GUI.RepeatButton(new Rect(1000,300,80,40), "Sword")) {
             Attack ();
         } else {
             if(!IsAttacking()) {
                 if(moving) {
                     Move(moveVector);
                 } else
                     Stand();
             }
 
         // Make the second button.
         if(GUI.RepeatButton(new Rect(20,500,80,40), "Left")) {
                 moveVector.x -= 1.0f;
                 moving = true;
                 
         
         }
             if(GUI.RepeatButton(new Rect(1000,500,80,40), "Right")) {
                 moveVector.x += 1.0f;
                 moving = true;
                 
         
         }
     }
 }
     
     
 
     
         
     
             
         
     
     
 
 
 }

All it does is places buttons and screws up my waling animation and attacking animation. It only plays first frame of walk animation when I use the a or d key to walk. The buttons don't do anything. Please help me!