if (document.images) {

var header_display_off = new Image();
header_display_off.src = "/img/header_display_off.gif";
var header_packaging_off = new Image();
header_packaging_off.src = "/img/header_packaging_off.gif";
var header_winepak_off = new Image();
header_winepak_off.src = "/img/header_winepak_off.gif";
var header_history_off = new Image();
header_history_off.src = "/img/header_history_off.gif";
var header_contactus_off = new Image();
header_contactus_off.src = "/img/header_contactus_off.gif";

var header_display_on = new Image();
header_display_on.src = "/img/header_display_on.gif";
var header_packaging_on = new Image();
header_packaging_on.src = "/img/header_packaging_on.gif";
var header_winepak_on = new Image();
header_winepak_on.src = "/img/header_winepak_on.gif";
var header_history_on = new Image();
header_history_on.src = "/img/header_history_on.gif";
var header_contactus_on = new Image();
header_contactus_on.src = "/img/header_contactus_on.gif";

}