var dom = document.getElementById;
var iex = document.all;
var ns4 = document.layers;
var rollOvers = new Object(), rollOverList = new Object();
var mouseX, mouseY, enterX, enterY;
var currentItem, currentText;

function popup( filename, params, width, height, resizable, scrollbars, windowName, centered )
{
	if ( width == 0 ) width = screen.availWidth - 20;
	if ( height == 0 ) height = screen.availHeight - 20;
	if ( centered == true ) {
		topX = (screen.availWidth/2)-(width/2);
		topY = (screen.availHeight/2)-(height/2);
	} else {
		topX = 20;
		topY = 20;
	}
	if ( params != "" ) params = "?" + params;
	window.open( filename + params, windowName, "resizable=" + resizable + ",scrollbars=" + scrollbars + ",top=" + topY + ", left=" + topX + ",width=" + width + ",height=" + height);
}

RollOver = function(root, ext)
{
	this.root = root;
	this.ext = ext;
	this.over = new Image();
	this.over = new Object();
	this.over.src = root+"-over"+ext;
	this.out = new Image();
	this.out = new Object();
	this.out.src = root+ext;
}

RollOverSet = function() {
	this.rollOvers = new Object();
	this.rollOverList = new Object();
}

RollOverSet.prototype.addRollOver = function( name, path, ext)
{
	var ro = new Object();
	ro.path = path;
	ro.ext = ext;
	this.rollOverList[name] = ro;
}

RollOverSet.prototype.loadRollOvers = function()
{
	var name;
	for ( name in this.rollOverList ) {
		var rol = this.rollOverList[name];
		this.rollOvers[name] = new RollOver( rol.path, rol.ext );
	}
}

RollOverSet.prototype.mouseOver = function( imgName )
{
	getElement(imgName).src = this.rollOvers[imgName].over.src;
}

RollOverSet.prototype.mouseOut = function( imgName )
{
	getElement(imgName).src = this.rollOvers[imgName].out.src;
}

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)
{
	var el = dom ? document.getElementById(name) : iex ? document.all[name] : ns4 ? eval("document."+name) : false;
	if ( el == null ) return null;
	el.css = ns4 ? el : el.style;
	el.getTop = function(){return parseInt(el.css.top) || 0};
	el.setTop = function(y){el.css.top = ns4 ? y: y+"px"};
	el.getLeft = function(){return parseInt(el.css.left) || 0};
	el.setLeft = function(x){el.css.left = ns4 ? x: x+"px"};
	el.getHeight = function(){return ns4 ? el.document.height : el.offsetHeight};
	el.getWidth = function(){return ns4 ? el.document.width : el.offsetWidth};
	el.getClipHeight = function(){return ns4 ? el.clip.height : el.offsetHeight};
	el.hideVis = function(){el.css.visibility="hidden"};
	el.showVis = function(){el.css.visibility="visible"};
	el.addEvent = addEvent;
	el.removeEvent = removeEvent;
	return el;
}

function getYMouse(e)
{
	return iex ? event.clientY : e.pageY;
}

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

ScrollObj = function(speed, groupName)
{
	this.speed = speed;
	this.trackObj = getElement(groupName+"ScrollTrack");
	this.upObj = getElement(groupName+"ScrollUp");
	this.downObj = getElement(groupName+"ScrollDown");
	this.dragObj = getElement(groupName+"ScrollThumb");
	this.contentMaskObj = getElement(groupName+"ContentClip");
	this.contentObj = getElement(groupName+"Content");
	this.obj = groupName+"ContentObject";
	eval(this.obj+"=this");
	
	this.dragHeight = this.dragObj.getHeight()-2 - (iex ? 4 : 0);
	this.trackHeight = getElement(groupName+"ScrollThumbTrack").getHeight();
	this.trackTop = this.trackObj.getTop();
	this.trackLength = this.trackHeight-this.dragHeight;
	this.trackBottom = this.trackTop+this.trackLength;
	this.contentMaskHeight = this.contentMaskObj.getClipHeight();
	this.contentHeight = this.contentObj.getHeight();
	this.contentLength = this.contentHeight-this.contentMaskHeight;
	this.scrollLength = this.trackLength/this.contentLength;
	this.scrollTimer = null;
	
	if (this.contentHeight <= this.contentMaskHeight) {
		this.dragObj.hideVis();
		this.upObj.hideVis();
		this.downObj.hideVis();
		this.trackObj.hideVis();
	} else {
		var self = this;
		this.trackObj.addEvent("onmousedown", function(e){self.scrollJump(e);return false});
		this.upObj.addEvent("onmousedown", function(){self.scroll(self.speed);return false});
		this.upObj.addEvent("onmouseup", function(){self.stopScroll()});
		this.upObj.addEvent("onmouseout", function(){self.stopScroll()});
		this.downObj.addEvent("onmousedown", function(){self.scroll(-self.speed);return false});
		this.downObj.addEvent("onmouseup", function(){self.stopScroll()});
		this.downObj.addEvent("onmouseout", function(){self.stopScroll()});
		this.dragObj.addEvent("onmousedown", function(e){self.startDrag(e);return false});
		if(iex) this.dragObj.addEvent("ondragstart", function(){return false});
	}
}

ScrollObj.prototype.startDrag = function(e)
{
	this.dragStartMouse = getYMouse(e);
	this.dragStartOffset = this.dragObj.getTop();
	var self = this;
	document.removeEvent("onmousemove");
	document.addEvent("onmousemove", function(e){self.drag(e)});
	document.addEvent("onmouseup", function(){self.stopDrag()});
}

ScrollObj.prototype.stopDrag = function() 
{
	document.removeEvent("onmousemove");
	document.addEvent("onmousemove", getMouse);
	document.removeEvent("onmouseup");
}

ScrollObj.prototype.drag = function(e)
{
	var currentMouse = getYMouse(e);
//	var currentMouse = getMouseY();
	var mouseDifference = currentMouse-this.dragStartMouse;
	var dragDistance = this.dragStartOffset+mouseDifference;
	var dragMovement = (dragDistance<this.trackTop) ? this.trackTop : (dragDistance>this.trackBottom) ? this.trackBottom : dragDistance;
	this.dragObj.setTop(dragMovement);
	var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
	this.contentObj.setTop(contentMovement);
}

ScrollObj.prototype.scroll = function(speed)
{
	var contentMovement = this.contentObj.getTop()+speed;
	var dragMovement = this.trackTop-Math.round(this.contentObj.getTop()*(this.trackLength/this.contentLength));
	if(contentMovement > 0){
		contentMovement = 0;
	}else if(contentMovement < -this.contentLength){
		contentMovement = -this.contentLength;
	}
	if ( dragMovement < this.trackTop ) {
		dragMovement = this.trackTop;
	} else if ( dragMovement > this.trackBottom ) {
		dragMovement = this.trackBottom;
	}
	this.contentObj.setTop(contentMovement);
	this.dragObj.setTop(dragMovement);
	this.scrollTimer = window.setTimeout(this.obj+".scroll("+speed+")",25);
}

ScrollObj.prototype.stopScroll = function()
{
	if(this.scrollTimer){
		window.clearTimeout(this.scrollTimer);
		this.scrollTimer = null;
	}
}

ScrollObj.prototype.scrollJump = function(e)
{
	var currentMouse = getYMouse(e);
	var dragDistance = currentMouse-(this.dragHeight/2);
	var dragMovement = (dragDistance<this.trackTop) ? this.trackTop : (dragDistance>this.trackBottom) ? this.trackBottom : dragDistance;
	this.dragObj.setTop(dragMovement);
	var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
	this.contentObj.setTop(contentMovement);
}

Portfolio = function()
{
	this.items = new Object();
}

Portfolio.prototype.getItem = function( itemName )
{
	return this.items[itemName];
}

Portfolio.prototype.addItem = function( item )
{
	this.items[item.getName()] = item;
}

Portfolio.prototype.load = function()
{
	var i;
	this.loaded = false;
	for ( i in this.items ) {
		this.items[i].load();
	}
}

PortfolioItem = function( name, filename, numPages )
{
	this.name = name;
	this.filename = filename;
	this.numPages = numPages;
	this.pages = new Array("");
	for ( i = 1; i <= this.numPages; i++ ) {
		this.pages[i] = new Image();
		this.pages[i].src = "images/portfolio/loading.jpg";
	}
}

PortfolioItem.prototype.load = function()
{
	for ( i = 1; i <= this.numPages; i++ ) {
		if ( this.pages[i] == null ) this.pages[i] = new Image();
		this.pages[i].src = "images/portfolio/samples/" + this.filename + i + ".jpg";
	}
}

PortfolioItem.prototype.getName = function()
{
	return this.name;
}

PortfolioItem.prototype.getSrc = function(page)
{
	return this.pages[page].src;
}

PortfolioItem.prototype.getNumPages = function()
{
	return this.numPages;
}

function displayItem( name, page )
{
	if ( currentItem != null ) getElement(currentItem + "Label").className = "item";
	if ( currentText != null ) currentText.className = "itemText";
	var item = portfolio.getItem(name);
	if ( item == null ) return;
	getElement("item").src = "images/portfolio/loading.jpg";
	item.load();
	currentItem = item.getName();
	currentText = getElement(currentItem+"Text"+page);
	currentText.className = "itemTextOn";
	getElement(currentItem + "Label").className = "itemOn";
	getElement("item").src = item.pages[page].src;
	for ( i = 1; i < 7; i++ ) {
		element = getElement("page"+i);
		if ( i <= item.getNumPages() ) element.showVis();
		else element.hideVis();
		if ( i == page ) element.src = "images/portfolio/page-on.gif";
		else element.src = "images/portfolio/page.gif";
	}
}

function getMouse(e)
{
	mouseY = iex ? event.clientY : e.pageY;
	mouseX = iex ? event.clientX : e.pageX;
}

function getMouseY()
{
	return mouseY;
}

function fixNetscape4()
{
	if ( ns4origWidth != window.innerWidth || ns4origHeight != window.innerHeight ) {
		window.location.reload();
	}	
}

if (document.layers)
{
	ns4origWidth = window.innerWidth;
	ns4origHeight = window.innerHeight;
	window.onresize = fixNetscape4;
}

document.addEvent("onmousemove", getMouse);