// Panelmenu

var ImagesLoaded = 0;
var MenuNameArray;
var FocusedIndex = new Array(); // Array is one element per group.  Array element is index of focused menu item in that group
var ShownPanelId = new Array(); // Array is one element per group.  Array element is text id of the currently shown panel for that group

function InitPanels(NumberOfGroups)
{
	// For each group of panels, only one object per panel is to be shown at a given time
	
	// Create array entries with default values of null strings
	for (i=0; i<NumberOfGroups; ++i) {
		ShownPanelId[i] = "";
	}
}

function InitMenus(NumberOfGroups, _MenuNameArray)
{
	// For each group of menus, only one object per menu is to be focused at a given time
	
	// Create array entries with default values of null strings
	for (i=0; i<NumberOfGroups; ++i) {
		FocusedIndex[i] = "-1";
	}

	// NOTE: Arrays of menus not yet implemented properly.  Can only have a single menu group, with group number 0
	MenuNameArray = _MenuNameArray;
	
	// NOTE: Arrays of menus not yet implemented properly.  Can only have a single menu group, with group number 0
	ImageArrayFocused = new Array();
	ImageArrayBlurred = new Array();
	for (i=0; i<MenuNameArray.length; ++i) {
		ImageArrayFocused[i] = new Image();
		ImageArrayFocused[i].src = "graphics/"+MenuNameArray[i]+"1.gif";
		ImageArrayBlurred[i] = new Image();
		ImageArrayBlurred[i].src = "graphics/"+MenuNameArray[i]+"0.gif";
	}

	ImagesLoaded = 1;
}

function Focus(itemindex) 
{	
	if (document.images && (ImagesLoaded==1)) {
		/* if all images and layers loaded... */
		if (document[MenuNameArray[itemindex]]) {
			/* get document source */
			document[MenuNameArray[itemindex]].src = ImageArrayFocused[itemindex].src;
		}
	}
}

function Blur(itemindex) 
{	
	if (document.images && (ImagesLoaded==1)) {
		/* if all images and layers loaded... */
		if (document[MenuNameArray[itemindex]]) {
			/* get document source */
			document[MenuNameArray[itemindex]].src = ImageArrayBlurred[itemindex].src;
		}
	}
}

function FocusMenu(groupnumber, itemindex) 
{
	if (FocusedIndex[groupnumber] != itemindex) {
		// Then blur previously focused menu item
		if (FocusedIndex[groupnumber] != "-1") {
			Blur(FocusedIndex[groupnumber]);
		}
	} 
	Focus(itemindex);
	FocusedIndex[groupnumber] = itemindex; // Remember which panel is currently shown
}

function Show(itemid) 
{
   obj=document.getElementById(itemid);
   visible=(obj.style.display!="none")
   if (!visible) {
     obj.style.display="block";
   }
}

function Hide(itemid) 
{
   obj=document.getElementById(itemid);
   visible=(obj.style.display!="none")
   if (visible) {
     obj.style.display="none";
   }
}

function ShowPanel(groupnumber, itemid) 
{
	if (ShownPanelId[groupnumber] != itemid) {
		// Then hide previously shown panel
		if (ShownPanelId[groupnumber] != "") {
			Hide(ShownPanelId[groupnumber]);
		}
	} 
	Show(itemid); // Now show the desired panel
	ShownPanelId[groupnumber] = itemid; // Remember which panel is currently shown
}