var usedynamic=false;
if ("3" <= navigator.appVersion.charAt(0)) {
        usedynamic=true;

        home_off = new Image(56,28);
        home_off.src = "/local_images/menu_home_off.gif";
        home_on = new Image(56,28);
        home_on.src = "/local_images/menu_home_on.gif";

        contact_off = new Image(62,28);
        contact_off.src = "/local_images/menu_contact_off.gif";
        contact_on = new Image(62,28);
        contact_on.src = "/local_images/menu_contact_on.gif";

        products_off = new Image(72,28);
        products_off.src = "/local_images/menu_products_off.gif";
        products_on = new Image(72,28);
        products_on.src = "/local_images/menu_products_on.gif";

        linktous_off = new Image(72,28);
        linktous_off.src = "/local_images/menu_linktous_off.gif";
        linktous_on = new Image(72,28);
        linktous_on.src = "/local_images/menu_linktous_on.gif";

        help_off = new Image(50,50);
        help_off.src = "/local_images/help_off.gif";
        help_on = new Image(50,50);
        help_on.src = "/local_images/help_on.gif";
}

function turnOn(button) {
	if (usedynamic) {
		eval(button).src = eval(button + "_on").src;
	}
}

function turnOff(button) {
	if (usedynamic) {
		eval(button).src = eval(button + "_off").src;
	}
}