pic1= new Image(); 
pic1.src=path + "images/tab-acceso"; 
pic2= new Image(); 
pic2.src=path + "images/tab-spento";
pic3= new Image(); 
pic3.src=path + "images/tab-left-acceso";
pic4= new Image(); 
pic4.src=path + "images/tab-left-spento";