// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// 
// Coded by Travis Beckham
// http://www.squidfingers.com | http://www.podlob.com
// If want to use this code, feel free to do so, but please leave this message intact.
//
// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- version date: 09/29/02 ---------------------------------------------------------

// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Cross-Browser Functions

var dom = document.getElementById;
var iex = document.all;
var ns4 = document.layers;

function addEvent(event,method){
	this[event] = method;
	if(ns4) this.captureEvents(Event[event.substr(2,event.length).toUpperCase()]);
}
function removeEvent(event){
	this[event] = null;
	if(ns4) this.releaseEvents(Event[event.substr(2,event.length).toUpperCase()]);
}
function getElement(name,nest){
	nest = nest ? 'document.'+nest+'.' : '';
	var el = dom ? document.getElementById(name) : iex ? document.all[name] : ns4 ? eval(nest+'document.'+name) : false;
	el.css = ns4 ? el : el.style;
	el.hideVis = function(){el.css.visibility='hidden'};
	el.showVis = function(){el.css.visibility='visible'};
	el.getTop = function(){return parseInt(el.css.top) || 0};
	el.setTop = function(y){el.css.top=y+"px"};
	el.getHeight = function(){return ns4 ? el.document.height : el.offsetHeight};
	el.getClipHeight = function(){return ns4 ? el.clip.height : el.offsetHeight};
	el.addEvent = addEvent;
	el.removeEvent = removeEvent;
	return el;
}
function getMouse(e){
	return iex ? event.clientY : e.pageY;
}

document.addEvent = addEvent;
document.removeEvent = removeEvent;

// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Utility Functions

function newImage(src){
	img = new Image();
	img.src = src;
	return img;
}
function imageSwap(img,obj,div){
	obj = eval(obj);
	if(document.layers && div != null){
		document.layers[div].document.images[img].src = obj.src;
	}else{
		document.images[img].src = obj.src;
	}
}
function fixNetscape(){
	if(ns4origWidth != window.innerWidth || ns4origHeight != window.innerHeight){
		window.location.reload();
	}	
}
if(document.layers){
	ns4origWidth = window.innerWidth;
	ns4origHeight = window.innerHeight;
	window.onresize = fixNetscape;
}

// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Scroll Functions

var currentContent = null;
var docLoaded = false;
var aboutOff = newImage('images/header_info.gif');
var aboutOn = newImage('images/header_info.gif');

function initScroller(){
	var n = navigator;
	var ua = n.userAgent.toLowerCase();
	if (ua.indexOf("compatible")>0)
	{
		scrollSpeed = 5; // scrolling speed
	}
	else
	{
		scrollSpeed = 10;
	}
	dragHeight = 39; // Height of scrollbar drag
	trackHeight = 410; // Height of scrollbar track
	trackObj = getElement('track'); // Reference to the scrollbar track div
	upObj = getElement('up'); // Reference to the up arrow div
	downObj = getElement('down'); // Reference to the down arrow div
	dragObj = getElement('drag'); // Reference to the scrollbar drag div
	contentMaskObj = getElement('contentMask'); // Reference to the content mask div
	trackTop = dragObj.getTop(); // Scrollbar top contraint
	trackLength = trackHeight-dragHeight; // Adjusted track height
	trackBottom = trackTop+trackLength; // Scrollbar bottom contraint
	contentMaskHeight = contentMaskObj.getClipHeight();// Height of the div that masks the content div
	scrollTimer = null;
	
	trackObj.addEvent('onmousedown',scrollJump);
	
	upObj.addEvent('onmousedown', function(){scroll(scrollSpeed);return false});
	upObj.addEvent('onmouseup', stopScroll);
	upObj.addEvent('onmouseout', stopScroll);
	
	downObj.addEvent('onmousedown', function(){scroll(-scrollSpeed);return false});
	downObj.addEvent('onmouseup', stopScroll);
	downObj.addEvent('onmouseout', stopScroll);
	
	dragObj.addEvent('onmousedown', startDrag);
	dragObj.addEvent('ondragstart', function(){return false});
	
	docLoaded = true;
	loadContent('about');
}
function loadContent(name){
	if(!docLoaded) return;
	if(currentContent!=null){
		imageSwap(currentContent, currentContent+'Off', 'nav');
		contentObj.setTop(0);
		contentObj.hideVis();
	}
	currentContent = name;
	contentObj = getElement(currentContent+'Content','contentMask');
	contentHeight = contentObj.getHeight(); // Height of the content div
	contentLength = contentHeight-contentMaskHeight; // Adjusted content height
	scrollLength = trackLength/contentLength; // Height difference between the scrollbar track and the content
	contentObj.showVis();
	dragObj.setTop(trackTop);
	if(contentHeight<=contentMaskHeight){
		trackObj.hideVis();
		upObj.hideVis();
		downObj.hideVis();
		dragObj.hideVis();
	}else{
		trackObj.showVis();
		upObj.showVis();
		downObj.showVis();
		dragObj.showVis();
	}
}
function startDrag(e){
	dragStartMouse = getMouse(e); // Holds the starting y mouse position
	dragStartOffset = dragObj.getTop(); // Holds the starting top position of the scrollbar drag
	document.addEvent('onmousemove', drag);
	document.addEvent('onmouseup', stopDrag);
	return false;
}
function stopDrag(){
	document.removeEvent('onmousemove');
	document.removeEvent('onmouseup');
}
function drag(e){
	var currentMouse = getMouse(e);
	var mouseDifference = currentMouse-dragStartMouse;
	var dragDistance = dragStartOffset+mouseDifference;
	var dragMovement = (dragDistance<trackTop) ? trackTop : (dragDistance>trackBottom) ? trackBottom : dragDistance;
	dragObj.setTop(dragMovement);
	var contentMovement = -(dragMovement-trackTop)*(1/scrollLength);
	contentObj.setTop(contentMovement);
	return false;
}
function scroll(speed){
	var contentMovement = contentObj.getTop()+speed;
	var dragMovement = trackTop-Math.round(contentObj.getTop()*(trackLength/contentLength));
	if(contentMovement > 0){
		contentMovement = 0;
	}else if(contentMovement < -contentLength){
		contentMovement = -contentLength;
	}
	if(dragMovement < trackTop){
		dragMovement = trackTop;
	}else if(dragMovement > trackBottom){
		dragMovement = trackBottom;
	}
	contentObj.setTop(contentMovement);
	dragObj.setTop(dragMovement);
	scrollTimer = window.setTimeout('scroll('+speed+')',25);
}
function stopScroll(){
	if(scrollTimer){
		window.clearTimeout(scrollTimer);
		scrollTimer = null;
	}
}
function scrollJump(e){
	var currentMouse = getMouse(e);
	var dragDistance = currentMouse-(dragHeight/2);
	var dragMovement = (dragDistance<trackTop) ? trackTop : (dragDistance>trackBottom) ? trackBottom : dragDistance;
	dragObj.setTop(dragMovement);
	var contentMovement = -(dragMovement-trackTop)*(1/scrollLength);
	contentObj.setTop(contentMovement);
	return false;
}
function hideOverflow(){
	var agent = navigator.userAgent.toLowerCase(); 
	if(agent.indexOf('mac') != -1 && document.all){
		document.body.scroll = 'no';
	}
}
// ||||||||||||||||||||||||||||||||||||||||||||||||||

window.onload = initScroller;
hideOverflow();
//hideScrollbars();

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);