unity c# GUI Texture

gistfile1.txt

public Texture2D normalTex;
public Texture2D hoverTex; 

 
	void OnMouseEnter () {
	 guiTexture.texture = hoverTex;
	}
	 
	void OnMouseExit(){
	 guiTexture.texture = normalTex;
	}
	 
	void OnMouseDown(){
	 Debug.Log("clicked");
	}