//=======================================================\\
//                    13thparallel.org                   \\
//                   Copyright (c) 2002                  \\ 
//   see (13thparallel.org/?title=about) for more info   \\
//=======================================================\\


function init() 
{
	if (!document.getElementById 
	|| !document.getElementsByTagName 
	|| !document.createElement 
	|| typeof document.getElementsByTagName("head")[0].innerHTML == "undefined"
	|| (window.showModalDialog && navigator.userAgent.toLowerCase().indexOf("mac") > -1)) {
		return;
	}
	
	// Position the canvas div
	setCanvas();
	window.onresize = setCanvas;

	// Set fontsize
	Text.size = parseInt(GetCookie ("fontsize", 11));
	document.getElementById("divPage").style.fontSize = Text.size + Text.unit;
	document.getElementById("divSizer").style.fontSize = Text.size + Text.unit;

	// Split content into columns
	columns = Columns.splitText(document.getElementById('divContent').innerHTML, colWidth, colHeight);
	while (columns.length < 2) 
	    columns.push("<p>&nbsp;</p>");
	numCols = columns.length - 1;
		
	// Place columns in div tags and create links
	doColumnsAndLinks();
	
	// Extract the column titles
	colTitles = getColumnTitles();
	
	// Setting the UI controls
	document.getElementById("divTitles").innerHTML = " : navigate";
	
	// Hide loading cover
	document.getElementById("divLoading").style.visibility = "hidden";

	// Get rid of pesky outlines
	destroyEvilLinkOutlines();
}

window.onload = init;

// Position the canvas div
function setCanvas() 
{
	canvas = new getCanvas();
	var canvasLeft = (canvas.w - document.getElementById("divCanvas").offsetWidth) / 2;
	var canvasTop = (canvas.h - document.getElementById("divCanvas").offsetHeight) / 3;
	if (canvasLeft < 0) canvasLeft = 0;
	if (canvasTop < 0) canvasTop = 0;
	document.getElementById("divCanvas").style.left = canvasLeft + "px";
	document.getElementById("divCanvas").style.top = canvasTop + "px";
}


// Text object for changing text size
var Text = {
	size : parseInt(GetCookie("fontsize", 11)),
	unit : "px",
	
	doSize : function(num) 
	{
		Text.size += num;
		if (Text.size < 1) Text.size = 1;
		SetCookie("fontsize", Text.size, 24*365);
		document.getElementById("divPage").style.fontSize = Text.size + Text.unit;
		document.getElementById("divSizer").style.fontSize = Text.size + Text.unit;
		init();
		if (currentCol > columns.length - 2) 
		{
			currentCol = columns.length - 2;
			objLink.moveTo(32 + currentCol*10, objLink.y);
			objSlider.moveTo(-currentCol*360, objSlider.y);
		}
	}
}

// Extract the column titles
function getColumnTitles() 
{
	var headers = new Array();
	var titles = new Array();
	var img = null;
	
	for (var i = 0; i < 100; i++) 
	{
		if (!document.getElementById("divColumn" + i)) break;
		
		for (var j = 1; j <= 6; j++) 
		{
			headers = document.getElementById("divColumn" + i).getElementsByTagName("h" + j);
			if (!headers || headers.length == 0) continue;
			
			img = headers[0].getElementsByTagName("img")[0];
			
			if (img && img.title) 
			{
				titles[i] = img.title.toLowerCase();
				break;
			}
			else if (img && img.alt) 
			{
				titles[i] = img.alt.toLowerCase();
				break;
			}
			else 
			{
				titles[i] = headers[0].innerHTML.toLowerCase();
				break;
			}
		}
		if (!titles[i] && i == 0) titles[i] = "navigate";
		if (!titles[i] && i != 0) titles[i] = titles[i-1];
	}
	return titles;
}


// Takes a chapter name and scrolls to it (if it exists).
function scrollToChapter(c) 
{
	chapter = c;
	// Set it to scroll to the right chapter.
	var i = 0;
	while (colTitles[i] != chapter && i < colTitles.length) { i++; }
	if (i != colTitles.length) scrollTo(i);
	return false;
}


// Get rid of pesky outlines
function destroyEvilLinkOutlines() 
{
	var lnks = document.links ? document.links : document.getElementsByTagName ? document.getElementsByTagName("a") : null;
	if (lnks) 
	{
		for (var m = 0; lnks[m]; m++) 
		{
			lnks[m].onfocus = function() { this.blur() };
		}
	}
}


function scrollTo(i) 
{
	if (columns.length > 2) 
	{
		currentCol = i;
		if (currentCol < 0) currentCol = 0;
		if (currentCol >= numCols - 1) currentCol = numCols - 1;
		setPos();
	}
}


function scrollLeftArrow() 
{
	if (currentCol > 0) 
	{
		currentCol--;
		setPos();
	}
}


function scrollRightArrow() 
{
	if (currentCol < numCols - 1) 
	{
		currentCol++;
		setPos();
	}
}


function setPos() 
{
	objLink.timeSlide(32 + currentCol*10, objLink.y, 1500, -0.999, null, true);
	objSlider.timeSlide(-currentCol*(colWidth+colSpace), objSlider.y, 1500, -0.999, null, true);
}


function showTitle(num) 
{
	document.getElementById("divTitles").innerHTML = " :&nbsp;" + colTitles[num];
}


function resetTitle() 
{
	document.getElementById("divTitles").innerHTML = " : navigate";
}

	
function openPrintVersion() 
{
	var url = "printversion.php" + location.search;
	var newWindow = window.open(url);
	newWindow.focus();
}


// Precache the images used for rollovers and that are inserted by innerHTML
precache("images/nav_text.gif");
precache("images/nav_square.gif");

var arrow_left_off = precache("images/arrow_left.gif");
var arrow_left_on = precache("images/arrow_left2.gif");
var arrow_right_off = precache("images/arrow_right.gif");
var arrow_right_on = precache("images/arrow_right2.gif");