//　HTMLの記述
//bodyタグに「onload="eventLoader()"」を追加

//アップ、ダウン、スクロールバーの画像サイズ
var upW = 15;
var upH = 36;
var downW = 15;
var downH = 35;
var dragW = 1;
var dragH = 1;

//スクロールの幅、スピード
var scrollH =134; // Height of scrollbar
var speed = 9; // Scroll speed

//アップ、ダウン、スクロールバーの画像位置（相対位置の場合使用）
var upImageL;
var upImageT = 644;
var downImageL;
var downImageT = 680;
var dragImageL = 9999;
var dragImageT = 9999;
var rulerImageL = 9999;
var rulerImageT = 9999;

var arrowImageL;


//*+*+*+*+*+↑↑以上、変更点。↓↓以下、変更不要。*+*+*+*+*+



// Browser detection
var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;
var moz = (navigator.userAgent.indexOf("Gecko")!=-1) ? true : false;

var mouseY; // Mouse Y position onclick
var mouseX; // Mouse X position onclick

var clickUp = false; // If click on up-arrow
var clickDown = false; // If click on down-arrow
var clickDrag = false; // If click on scrollbar
var clickAbove = false; // If click above scrollbar
var clickBelow = false; // If click below scrollbar

var timer = setTimeout("",1000); // Repeat variable
var upL; // Up-arrow X
var upT; // Up-arrow Y
var downL; // Down-arrow X
var downT; // Down-arrow Y
var dragL; // Scrollbar X
var dragT; // Scrollbar Y
var rulerL; // Ruler X
var rulerT; // Ruler Y
var contentT; // Content layer Y;
var contentH; // Content height
var contentClipH; // Content clip height
var scrollLength; // Number of pixels scrollbar should move
var startY; // Keeps track of offset between mouse and span

// Mousedown
function down(e){
	if((document.layers && e.which!=1) || (document.all && event.button!=1)) return true; // Enables the right mousebutton
	getMouse(e);
	startY = (mouseY - dragT);
	
	// If click on up-arrow
	if(mouseX >= upL && (mouseX <= (upL + upW)) && mouseY >= upT && (mouseY <= (upT + upH))){
		clickUp = true;
		return scrollUp();
	}	
	// Else if click on down-arrow
	else if(mouseX >= downL && (mouseX <= (downL + downW)) && mouseY >= downT && (mouseY <= (downT + downH))){
		clickDown = true;
		return scrollDown();
	}
	// Else if click on scrollbar
	else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= dragT && (mouseY <= (dragT + dragH))){
		clickDrag = true;
		return false;
	}
	else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= rulerT && (mouseY <= (rulerT + scrollH))){
		// If click above drag
		if(mouseY < dragT){
			clickAbove = true;
			clickUp = true;
			return scrollUp();
		}
		// Else click below drag
		else{
			clickBelow = true;
			clickDown = true;
			return scrollDown();
		}
	}
	// If no scrolling is to take place
	else{
		return true;
	}
}

// Drag function
function move(e){
	if(clickDrag && contentH > contentClipH){
		getMouse(e);
		dragT = (mouseY - startY);
		
		if(dragT < (rulerT))
			dragT = rulerT;		
		if(dragT > (rulerT + scrollH - dragH))
			dragT = (rulerT + scrollH - dragH);
		
		contentT = ((dragT - rulerT)*(1/scrollLength));
		contentT = eval('-' + contentT);

		moveTo();
		
		// So ie-pc doesn't select gifs
		if(ie4)
			return false;
	}
}

function up(){
	clearTimeout(timer);
	// Resetting variables
	clickUp = false;
	clickDown = false;
	clickDrag = false;
	clickAbove = false;
	clickBelow = false;
	return true;
}

// Reads content layer top
function getT(){
	if(ie4)
		contentT = document.all.content.style.pixelTop;
	else if(nn4)
		contentT = document.contentClip.document.content.top;
	else if(dom)
		contentT = parseInt(document.getElementById("content").style.top);
}

// Reads mouse X and Y coordinates
function getMouse(e){
	if(ie4){
		mouseY = event.clientY + document.body.scrollTop;
		mouseX = event.clientX + document.body.scrollLeft;
	}
	else if(nn4 || dom){
		mouseY = e.pageY;
		mouseX = e.pageX;
	}
}

// Moves the layer
function moveTo(){
	if(ie4){
		document.all.content.style.top = contentT;
		document.all.ruler.style.top = dragT;
		document.all.drag.style.top = dragT;
	}
	else if(nn4){
		document.contentClip.document.content.top = contentT;
		document.ruler.top = dragT;
		document.drag.top = dragT;
	}
	else if(dom){
		document.getElementById("content").style.top = contentT + "px";
		document.getElementById("drag").style.top = dragT + "px";
		document.getElementById("ruler").style.top = dragT + "px";
	}
}

// Scrolls up
function scrollUp(){
	getT();
	
	if(clickAbove){
		if(dragT <= (mouseY-(dragH/2)))
			return up();
	}
	
	if(clickUp){
		if(contentT < 0){		
			dragT = dragT - (speed*scrollLength);
			
			if(dragT < (rulerT))
				dragT = rulerT;
				
			contentT = contentT + speed;
			if(contentT > 0)
				contentT = 0;
			
			moveTo();
			timer = setTimeout("scrollUp()",25);
		}
	}
	return false;
}

// Scrolls down
function scrollDown(){
	getT();
	
	if(clickBelow){
		if(dragT >= (mouseY-(dragH/2)))
			return up();
	}

	if(clickDown){
		if(contentT > -(contentH - contentClipH)){
			dragT = dragT + (speed*scrollLength);
			if(dragT > (rulerT + scrollH - dragH))
				dragT = (rulerT + scrollH - dragH);
			
			contentT = contentT - speed;
			if(contentT < -(contentH - contentClipH))
				contentT = -(contentH - contentClipH);
			
			moveTo();
			timer = setTimeout("scrollDown()",25);
		}
	}
	return false;
}

// reloads page to position the layers again
function reloadPage(){
	location.reload();
}

// Preload
function eventLoader(){
	if(arrowImageL<=718) arrowImageL = 718;
	
	if(ie4){
		// Up-arrow X and Y variables
		upL = arrowImageL;
		upT = upImageT;
		// Down-arrow X and Y variables
		downL = arrowImageL;
		downT = downImageT;
		// Scrollbar X and Y variables
		dragL = dragImageL;
		dragT = dragImageT;
		// Ruler Y variable
		rulerT = rulerImageT;
		// Height of content layer and clip layer
		contentH = parseInt(document.all.content.scrollHeight);
		contentClipH = parseInt(document.all.contentClip.style.height);
	}
	else if(nn4){
		// Up-arrow X and Y variables
		upL = arrowImageL;
		upT = upImageT;
		// Down-arrow X and Y variables
		downL = arrowImageL;
		downT = downImageT;
		// Scrollbar X and Y variables
		dragL = dragImageL;
		dragT = dragImageT;
		// Ruler Y variable
		rulerT = rulerImageT;
		// Height of content layer and clip layer
		contentH = document.contentClip.document.content.clip.bottom;
		contentClipH = document.contentClip.clip.bottom;
	}
	else if(dom){
		// Up-arrow X and Y variables
		upL = arrowImageL-10;
		upT = upImageT;
		// Down-arrow X and Y variables
		downL = arrowImageL-10;
		downT = downImageT;
		// Scrollbar X and Y variables
		dragL = dragImageL;
		dragT = dragImageT;
		// Ruler Y variable
		rulerT = rulerImageT;
		// Height of content layer and clip layer
		contentH = parseInt(document.getElementById("content").offsetHeight);
		contentClipH = parseInt(document.getElementById("contentClip").offsetHeight);
		document.getElementById("content").style.top = 0 + "px";
		document.getElementById("content").style.right = 10 + "px";
	}
	
	// Number of pixels scrollbar should move
	scrollLength = ((scrollH-dragH)/(contentH-contentClipH));
	// Initializes event capturing
	if(nn4){
		document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP);
		window.onresize = reloadPage;
	}
	else if(ie4 || dom){
		window.onresize = reloadPage;
	}
	document.onmousedown = down;
	document.onmousemove = move;
	document.onmouseup = up;
}

function movelayer(){
	var lay=document.getElementById?document.getElementById("contentClip"):document.all?document.all["contentClip"]:document.layers?document.layers["contentClip"]:null
	var winw=document.all?document.body.clientWidth:window.innerWidth
	var winh=document.all?document.body.clientHeight:window.innerHeight
	var layw=document.layers?lay.clip.width:lay.offsetWidth
	var layh=document.layers?lay.clip.height:lay.offsetHeight
	var scrx=document.all?document.body.scrollLeft:window.pageXOffset
	var scry=document.all?document.body.scrollTop:window.pageYOffset
	var x_center=(winw-layw)/2+scrx+225
	var y_center=599
	
	if(x_center<=514) x_center = 514;
	
	
	if(document.layers){
		lay.moveTo(x_center,y_center)
	}else{
		lay.style.left=x_center
		lay.style.top=y_center
	}
	
	arrowImageL = x_center + 204;
	window.onresize = reloadPage;
}

function scrollcheck(){
	var flag=false
	if(_scrx!=window.pageXOffset){_scrx=window.pageXOffset;flag=true}
	if(_scry!=window.pageYOffset){_scry=window.pageXOffset;flag=true}
	if(flag){movelayer()}
	setTimeout("scrollcheck()",200)
}

function init(){
	if(document.all){
		window.onscroll=movelayer
	}else{
		_scrx=0
		_scry=0
		scrollcheck()
	}
	movelayer()
	setTimeout("window.onresize=document.layers?function(){location.reload()}:movelayer",1000)
}