Detect touch on sprite , UNITY

touchspritedetect.cs

	public bool uiTouch (GameObject go)
	{
		if (go.GetComponent<SpriteRenderer> () != null)
		if (Input.GetButtonUp ("Fire1") && go.activeInHierarchy) {

			//Gets the world position of the mouse on the screen        
			Vector2 mousePosition = Camera.main.ScreenToWorldPoint (Input.mousePosition);

			//Checks whether the mouse is over the sprite
			bool overSprite = go.GetComponent<SpriteRenderer> ().bounds.Contains (mousePosition);

			//If it's over the sprite
			if (overSprite) {
				//If we've pressed down on the mouse (or touched on the iphone)
				Instantiate (sfxclick);
				return true;




			}
		}
		return false;
}