// Browser detection
var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? 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("",500); // 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

var speed = 15; 

// Mousedown
function down(e){
	if((document.layers && e.which!=1) || (document.all && event.button!=1 && !window.opera)) return true; // Enables the right mousebutton
   getMouse(e);
	startY = (mouseY - offsetY - 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 + offsetY)  && (mouseY <= (dragT + dragH  + offsetY))){

		clickDrag = true;
		return false;
	}
	else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= (rulerT + offsetY) && mouseY <= (rulerT + scrollH + offsetY)){

		// If click above drag

		if(mouseY < (dragT + offsetY)){
			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 - offsetY);
		if(dragT < (rulerT))
			dragT = rulerT;
		if(dragT > (rulerT + scrollH - dragH))
			dragT = (rulerT + scrollH - dragH);
		//alert("dragT: "+dragT);
		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.scrollContent.style.pixelTop;
	else if(nn4)
		contentT = document.contentClip.document.scrollContent.top;
	else if(dom)
		contentT = parseInt(document.getElementById("scrollContent").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(dom){
		document.getElementById("scrollContent").style.top = contentT + "px";
		document.getElementById("drag").style.top = dragT + "px";
		document.getElementById("ruler").style.top = dragT + "px";
	}
	else if(ie4){
		document.all.scrollContent.style.top = contentT;
		document.all.ruler.style.top = dragT;
		document.all.drag.style.top = dragT;
	}
	else if(nn4){
		document.contentClip.document.scrollContent.top = contentT;
		document.ruler.top = dragT;
		document.drag.top = dragT;
	}
}

// Scrolls up
function scrollUp(){
	getT();

	if(clickAbove){
		if(dragT <= (mouseY - offsetY - (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 - offsetY -(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;
}

function wheel (event){
	var delta = 0;
	if (!event) event = window.event;
	if (event.wheelDelta) {
		delta = event.wheelDelta/120; 
		if (window.opera && window.navigator.userAgent.indexOf('Macintosh') < 0) delta = -delta;
	} else if (event.detail) {
		delta = -event.detail/3;
	}
	if (delta){
		if(delta < 0){
			wheelDown();
		}else{
			wheelUp();
		}
		if (event.preventDefault) event.preventDefault();
		event.returnValue = false;
	}
}

function wheelDown(){
	getT();

	
	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;
}

function wheelUp(){
	getT();
	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;
}

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

// Preload
function eventLoader(){
   if(dom){
		// Up-arrow X and Y variables
		upL = parseInt(document.getElementById("up").style.left)+parseInt(document.getElementById("content").offsetLeft);
		upT = parseInt(document.getElementById("up").style.top)+parseInt(document.getElementById("content").offsetTop);
		// Down-arrow X and Y variables
		downL = parseInt(document.getElementById("down").style.left)+parseInt(document.getElementById("content").offsetLeft);
		downT = parseInt(document.getElementById("down").style.top)+parseInt(document.getElementById("content").offsetTop);;
		// Scrollbar X and Y variables
		dragL = parseInt(document.getElementById("drag").style.left)+parseInt(document.getElementById("content").offsetLeft);
		dragT = parseInt(document.getElementById("drag").style.top);
		startDragT= parseInt(document.getElementById("drag").style.top)+parseInt(document.getElementById("content").offsetTop);
		offsetY=parseInt(document.getElementById("content").offsetTop);
		// Ruler Y variable
		rulerT = parseInt(document.getElementById("ruler").style.top);
		// Height of content layer and clip layer
		contentH = parseInt(document.getElementById("scrollContent").offsetHeight);
		contentClipH = parseInt(document.getElementById("contentClip").offsetHeight);

		document.getElementById("scrollContent").style.top = 0 + "px";
   }
	else if(ie4){
		// Up-arrow X and Y variables
		upL = document.all.up.style.pixelLeft;
		upT = document.all.up.style.pixelTop;
		// Down-arrow X and Y variables
		downL = document.all.down.style.pixelLeft;
		downT = document.all.down.style.pixelTop;
		// Scrollbar X and Y variables
		dragL = document.all.drag.style.pixelLeft;
		dragT = document.all.drag.style.pixelTop;
		// Ruler Y variable
		rulerT = document.all.ruler.style.pixelTop;
		// 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 = document.up.left;
		upT = document.up.top;
		// Down-arrow X and Y variables
		downL = document.down.left;
		downT = document.down.top;
		// Scrollbar X and Y variables
		dragL = document.drag.left;
		dragT = document.drag.top;
		// Ruler Y variable
		rulerT = document.ruler.top;
		// Height of content layer and clip layer
		contentH = document.contentClip.document.content.clip.bottom;
		contentClipH = document.contentClip.clip.bottom;
	}
	// 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;
	}
	if(contentH > contentClipH){
				document.getElementById("up").style.visibility ="visible";
				document.getElementById("down").style.visibility ="visible";
				document.getElementById("drag").style.visibility ="visible";
				document.onmousedown = down;
				document.onmousemove = move;
				document.onmouseup = up;
				if (window.addEventListener) document.getElementById("content").addEventListener('DOMMouseScroll', wheel, false);
				document.getElementById("content").onmousewheel = wheel;
				
	}else{
		document.getElementById("up").style.visibility ="hidden";
		document.getElementById("down").style.visibility ="hidden";
		document.getElementById("drag").style.visibility ="hidden";
	}

}
function reset_drag(t){
		document.getElementById("drag").style.top=t+"px";
		document.getElementById("ruler").style.top=t+"px";
}