Left mouse button not working in web player?

I have this piece of code in my game that doesn’t seem to work once in the web player, the resolution is set to 960 x 600 and all code is functional in the Unity editor, anyone know why the left click isn’t registering?

if (Input.GetMouseButtonDown (0)) {
		targetPos = new Vector2 ((Input.mousePosition.x) / 100, (Input.mousePosition.y - 600) / 100);
		moveDirection = targetPos - new Vector2 (transform.position.x, transform.position.y);
		targetDist = Vector2.Distance (targetPos, new Vector2 (transform.position.x, transform.position.y));
		isWalking = true;
}

Make sure the code is in an Update fuction