//
// Menu navigation
//

var ns4;
var ie4;
var ns6;

NUM_MAIN_MENUS = 6;
menu_img_on = new Array();
menu_img_off = new Array();
menu_img_sel = new Array();

NUM_SUB_MENUS = 6;
sub_img_on = new Array();
sub_img_off = new Array();

var currentMenu = -1;

function isBrowser(b,v)
{
	/*
	** Check if the current browser is compatible
	**  b  browser name
	**  v  version number (if 0 don't check version)
	** returns true if browser equals and version equals or greater
	*/
	browserOk = false;
	versionOk = false;
	
	browserOk = (navigator.appName.indexOf(b) != -1);
	if (v == 0) versionOk = true;
	else  versionOk = (v <= parseInt(navigator.appVersion));
	return browserOk && versionOk;
}


// Test for which browser
if (isBrowser('Netscape', 4)) ns4 = true;
if (document.all) ie4 = true;
if ((document.getElementById) && (!document.all)) ns6 = true;
if (ns6 == true) ns4 = false;

// Number of seconds since last menu clear:
var menusCleared = 0;
// Number of seconds of idle time before clearing menus:
var MENU_START_TIME = 5;

function checkClearMenus()
{
	if (menusCleared > 0) {
		menusCleared--;
		if (menusCleared == 0) {
			clearAll(currentMenu);
		}
	}
}

function NewMenuImage(arg)
{
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function InitMenus(path, curMenu)
{
	// Save this for clearing purposes:
	currentMenu = curMenu;
	
	// Main menus:
	for (i = 0;  i < NUM_MAIN_MENUS;  i++) {
		menu_img_on[i] = NewMenuImage(path + "images/menu_images/menu_" + i + "_on.gif");
		menu_img_off[i] = NewMenuImage(path + "images/menu_images/menu_" + i + "_off.gif");
		menu_img_sel[i] = NewMenuImage(path + "images/menu_images/menu_" + i + "_on.gif");
	}
}

var windowTimerFunc = window.setInterval("checkClearMenus()", 1000);

function showLayer(which)
{
	if (ie4) {
		document.all[which].style.visibility = "visible";
	}
	if (ns6) {
		document.getElementById(which).style.visibility = "visible";
	}
	if (ns4) {
		document.layers[which].visibility = "show";
	}
}

function hideLayer(which)
{
	if (ie4) {
		document.all[which].style.visibility = "hidden";
	}
	if (ns6) {
		document.getElementById(which).style.visibility = "hidden";
	}
	if (ns4) {
		document.layers[which].visibility = "hide";
	}
}

function unHiliteAllMenus()
{
	if (ns4) {
		for (i = 0;  i < NUM_MAIN_MENUS;  i++) {
			document["menu_" + i].src = menu_img_off[i].src;
		}
	} else {
		for (i = 0;  i < NUM_MAIN_MENUS;  i++) {
			document["menu_" + i].src = menu_img_off[i].src;
		}
	}
}

function hideAllSubMenus()
{
	for (i = 0;  i < NUM_SUB_MENUS;  i++) {
		hideLayer("submenu_" + i);
	}
}

function hiliteMenu(menuNum)
{
	if (menuNum >= 0) {
		// Hilite the selected menu:
		if (ns4) {
			document["menu_" + menuNum].src = menu_img_on[menuNum].src;
		} else {
			document["menu_" + menuNum].src = menu_img_on[menuNum].src;
		}
	}
}

function selectMenu(menuNum)
{
	if (menuNum >= 0) {
		// Hilite the selected menu:
		if (ns4) {
			document["menu_" + menuNum].src = menu_img_sel[menuNum].src;
		} else {
			document["menu_" + menuNum].src = menu_img_sel[menuNum].src;
		}
	}
}

function clearAll(menuNum)
{
	unHiliteAllMenus();
	selectMenu(menuNum);
	hideAllSubMenus();
	menusCleared = 0;
}

function clearAllWithSubmenu(menuNum)
{
	unHiliteAllMenus();
	hiliteMenu(menuNum);
	hideAllSubMenus();
	menusCleared = 0;
}

function showSubMenu(menuNum)
{
	// First, unhilite the other menus and hide the sub-menus:
	clearAllWithSubmenu(menuNum);
	menusCleared = MENU_START_TIME;
	
	// Show the selected sub-menu:
	showLayer("submenu_" + menuNum);
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}