function showMenu(id_menu){
var my_menu = document.getElementById(id_menu);
if(my_menu.style.display=="none" || my_menu.style.display==""){
	my_menu.style.display="block";
	} else { 
	my_menu.style.display="none";
	}
}

image1 = new Image();
image1.src = "http://www.horeko.nl/inc/gfx/menu/menu_home_hover.png";
image2 = new Image();
image2.src = "http://www.horeko.nl/inc/gfx/menu/menu_mogelijkheden_hover.png";
image3 = new Image();
image3.src = "http://www.horeko.nl/inc/gfx/menu/menu_voordelen_hover.png";
image4 = new Image();
image4.src = "http://www.horeko.nl/inc/gfx/menu/menu_service_hover.png";
image5 = new Image();
image5.src = "http://www.horeko.nl/inc/gfx/menu/menu_diensten_hover.png";
image6 = new Image();
image6.src = "http://www.horeko.nl/inc/gfx/menu/menu_tarieven_hover.png";
image7 = new Image();
image7.src = "http://www.horeko.nl/inc/gfx/menu/menu_bestellen_hover.png";
image8 = new Image();
image8.src = "http://www.horeko.nl/inc/gfx/menu/menu_partners_hover.png";
image9 = new Image();
image9.src = "http://www.horeko.nl/inc/gfx/menu/menu_contact_hover.png";