// JavaScript Document
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// 
// 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: 01/24/03 ---------------------------------------------------------

// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// Cross-Browser Functions
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// Ex.
// speed, dragWidth, trackWidth, trackObj, leftObj, rightObj, dragObj, contentMaskObj, contentObj
//	myScroll = new ScrollObj(6,21,110,"track","up","down","drag","contentMask","content");

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.getLeft = function(){return parseInt(el.css.left) || 0};
	el.setLeft = function(x){el.css.left = ns4 ? x: x+"px"};
	el.getWidth = function(){return ns4 ? el.document.width : el.offsetWidth};
	el.getClipWidth = function(){return ns4 ? el.clip.width : el.offsetWidth};
	el.hideVis = function(){el.css.visibility="hidden"};
	el.addEvent = addEvent;
	el.removeEvent = removeEvent;
	return el;
}
function getXMouse(e){
	return iex ? event.clientX : e.pageX;
}

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

// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Scroller Class

//ScrollObj = function(speed, dragWidth, trackWidth, trackObj, leftObj, rightObj, dragObj, contentMaskObj, contentObj){
ScrollObj = function(speed, dragWidth, trackWidth, trackObj, leftObj, rightObj, dragObj, contentMaskObj, contentObj){
	this.speed = speed;

	this.dragWidth = dragWidth;
	this.trackWidth = trackWidth;
	this.trackObj = getElement(trackObj);
	this.leftObj = getElement(leftObj);
	this.rightObj = getElement(rightObj);
	this.dragObj = getElement(dragObj);
	this.contentMaskObj = getElement(contentMaskObj);
	this.contentObj = getElement(contentObj,contentMaskObj);
	this.obj = contentObj+"Object";
	eval(this.obj+"=this");

	this.trackTop = this.dragObj.getLeft();
	
	this.trackLength = this.trackWidth-this.dragWidth;
//	this.trackLength = this.trackWidth-this.dragWidth;

	this.trackBottom = this.trackTop+this.trackLength;
	this.contentMaskHeight = this.contentMaskObj.getClipWidth();
	this.contentHeight = this.contentObj.getWidth();
	this.contentLength = this.contentHeight-this.contentMaskHeight;
	this.scrollLength = this.trackLength/this.contentLength;
	this.scrollTimer = null;
	
	if(this.contentHeight <= this.contentMaskHeight){
		 this.dragObj.hideVis();
	}else{
		 var self = this;
		 this.trackObj.addEvent("onmousedown", function(e){self.scrollJump(e);return false});
		 this.leftObj.addEvent("onmousedown", function(){self.scroll(self.speed);return false});
		 this.leftObj.addEvent("onmouseup", function(){self.stopScroll()});
		 this.leftObj.addEvent("onmouseout", function(){self.stopScroll()});
		 this.rightObj.addEvent("onmousedown", function(){self.scroll(-self.speed);return false});
		 this.rightObj.addEvent("onmouseup", function(){self.stopScroll()});
		 this.rightObj.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 = getXMouse(e);
	this.dragStartOffset = this.dragObj.getLeft();
	var self = this;
	document.addEvent("onmousemove", function(e){self.drag(e)});
	document.addEvent("onmouseup", function(){self.stopDrag()});
}
ScrollObj.prototype.stopDrag = function(){
	document.removeEvent("onmousemove");
	document.removeEvent("onmouseup");
}
ScrollObj.prototype.drag = function(e){
	var currentMouse = getXMouse(e);
	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.setLeft(dragMovement);
	var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
	this.contentObj.setLeft(contentMovement);
}
ScrollObj.prototype.scroll = function(speed){
	var contentMovement = this.contentObj.getLeft()+speed;
	var dragMovement = this.trackTop-Math.round(this.contentObj.getLeft()*(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.setLeft(contentMovement);
	this.dragObj.setLeft(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 = getXMouse(e);
	var dragDistance = currentMouse-(this.dragWidth/2);
	var dragMovement = (dragDistance<this.trackTop) ? this.trackTop : (dragDistance>this.trackBottom) ? this.trackBottom : dragDistance;
	this.dragObj.setLeft(dragMovement);
	var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
	this.contentObj.setLeft(contentMovement);
}

// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Misc Functions

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

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