// A cascading menu script by Fredrik Fridsten 2000 (c)
// Feel free to use this, but please mention in a comment in the code.

// To configure the script:
// Change the nom value to the number of menus that you want to use
// Note: Always make sure that this is correct, otherwise you might get a javascript error.

// The phrases "../images/opened.gif" and "../images/closed.gif" should be referring to the
// pictures you might use.
// If you don't want to use images, just remove the picopen and picclose functions.
// Also remove the lines in the toggle function that refer to those.

// The input variable to the toggle function is the number of the submenu to open/close,
// starting with 1. http://www.fridsten.se/script/

var lastn;
var isIE4;
var isNav4;
var isNav6;

function setbrowser() {
	if (navigator.appVersion.charAt(0) == "4") {
		if (navigator.appName.indexOf("Explorer") >= 0) {
			isIE4 = true;
		}
		else {
			isNav4 = true;
		}
	}
	else if (navigator.appVersion.charAt(0) > "4") {
		isNav6 = true;
	}
	if (isNav4) { // Setting the visibility for NN and IE
		visible = 'show';
		hidden = 'hide';
	}
	else if (isIE4) {
		visible = 'visible';
		hidden = 'hidden';
	}
	else if (isNav6) {
		visible = 'visible';
		hidden = 'hidden';
	}
}

// A couple of small functions that changes the image by the clicked menu
function picopen(n) {
	title = ('title' + n);
	pic = ('pic' + n);
	if (isNav4) {
		document.layers[title].document.images[pic].src = "../images/opened.gif";
	}
	else if (isIE4) {
		document.all(pic).src = "../images/opened.gif";
	}
	else if (isNav6) {
		document.getElementById(pic).src = "../images/opened.gif";
	}
}

function picclose(n) {
	title = ('title' + n);
	pic = ('pic' + n);
	if (isNav4) {
		document.layers[title].document.images[pic].src = "../images/closed.gif";
	}
	else if (isIE4) {
		document.all(pic).src = "../images/closed.gif";
	}
	else if (isNav6) {
		document.getElementById(pic).src = "../images/closed.gif";
	}
}

// The main scripts for toggling the selected menu
// Input variables:
// n = the number of the submenu to show/hide

lastn = 0;

function lasttoggle(n) {
	if (n > 0) {
		menu = ('submenu' + n);
		if (isNav4) {
			submenu = document.layers[menu];
		}
		else if (isIE4) {
			submenu = document.all(menu).style;
		}
		else if (isNav6) {
			submenu = document.getElementById(menu).style;
		}
		if (submenu.visibility.toLowerCase() == visible) {
			submenu.visibility = hidden;
			picclose(n); // Remove this if you don't use pictures
		}
	}
}

function toggle(n) {
	var menu = ('submenu' + n);
	if (isNav4) {
		submenu = document.layers[menu];
	}
	else if (isIE4) {
		submenu = document.all(menu).style;
	}
	else if (isNav6) {
		submenu = document.getElementById(menu).style;
	}
	if (submenu.visibility.toLowerCase() == visible) {
		submenu.visibility = hidden;
		picclose(n); // Remove this if you don't use pictures
	}
	else {
		submenu.visibility = visible;
		picopen(n); // Remove this if you don't use pictures
		if (lastn != n) {
			lasttoggle(lastn);
		}
	}
	lastn = n;
}