var upH = 14;
var upW = 14;
var downH = 14;
var downW = 14;
var dragH = 27;
var dragW = 14;
var scrollH = (typeof(scrollH)=="undefined") ? 161 : scrollH;
var speed = 4;

var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;

var mouseY;
var mouseX;

var clickUp = false;
var clickDown = false;
var clickDrag = false;
var clickAbove = false;
var clickBelow = false;

var timer = setTimeout("",500);
var upL;
var upT;
var downL;
var downT;
var dragL;
var dragT;
var rulerL;
var rulerT;
var contentT;
var contentH;
var contentClipH;
var scrollLength;
var startY;


function down(e){
	if((document.layers && e.which!=1) || (document.all && event.button!=1)) return true;
	getMouse(e);
	startY = (mouseY - dragT);
	

	if(mouseX >= upL && (mouseX <= (upL + upW)) && mouseY >= upT && (mouseY <= (upT + upH))){
		clickUp = true;
		return scrollUp();
	}	

	else if(mouseX >= downL && (mouseX <= (downL + downW)) && mouseY >= downT && (mouseY <= (downT + downH))){
		clickDown = true;
		return scrollDown();
	}

	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(mouseY < dragT){
			clickAbove = true;
			clickUp = true;
			return scrollUp();
		}
		else{
			clickBelow = true;
			clickDown = true;
			return scrollDown();
		}
	}
	else{
		return true;
	}
}

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();
		
		if(ie4)
			return false;
	}
}

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

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);
}

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;
	}
}

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";
	}
}

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;
}

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;
}

function reloadPage(){
	location.reload();
}

function eventLoader(){
	if(ie4){
		if(document.all.up) {
			upL = document.all.up.style.pixelLeft;
			upT = document.all.up.style.pixelTop;		

			downL = document.all.down.style.pixelLeft;
			downT = document.all.down.style.pixelTop;

			dragL = document.all.drag.style.pixelLeft;
			dragT = document.all.drag.style.pixelTop;		

			rulerT = document.all.ruler.style.pixelTop;		

			contentH = parseInt(document.all.content.scrollHeight);
			contentClipH = parseInt(document.all.contentClip.style.height);
		}
	}
	else if(nn4){
		if(document.up) {
			upL = document.up.left;
			upT = document.up.top;		

			downL = document.down.left;
			downT = document.down.top;		

			dragL = document.drag.left;
			dragT = document.drag.top;		

			rulerT = document.ruler.top;

			contentH = document.contentClip.document.content.clip.bottom;
			contentClipH = document.contentClip.clip.bottom;
		}
	}
	else if(dom){
		if(document.getElementById("up")){
			upL = parseInt(document.getElementById("up").style.left);
			upT = parseInt(document.getElementById("up").style.top);

			downL = parseInt(document.getElementById("down").style.left);
			downT = parseInt(document.getElementById("down").style.top);

			dragL = parseInt(document.getElementById("drag").style.left);
			dragT = parseInt(document.getElementById("drag").style.top);

			rulerT = parseInt(document.getElementById("ruler").style.top);

			contentH = parseInt(document.getElementById("content").offsetHeight);
			contentClipH = parseInt(document.getElementById("contentClip").offsetHeight);
			document.getElementById("content").style.top = 0 + "px";
		}
	}

	scrollLength = ((scrollH-dragH)/(contentH-contentClipH));

	if(nn4){
		document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP);
		window.onresize = reloadPage;
	}
	document.onmousedown = down;
	document.onmousemove = move;
	document.onmouseup = up;
}

function showLayers() {
	if(ie4){
		if(document.all.up){
			document.all.up.style.visibility = "visible";
			document.all.down.style.visibility = "visible";
			document.all.drag.style.visibility = "visible";
			document.all.contentClip.style.visibility = "visible";
		}
	}
	else if(nn4){
		if(document.up){
			document.up.visibility = "show";
			document.down.visibility = "show";
			document.drag.visibility = "show";
			document.contentClip.visibility = "show";
		}
	}
	else if(dom){
		if(document.getElementById("up")) {
			document.getElementById("up").style.visibility = "visible";
			document.getElementById("down").style.visibility = "visible";
			document.getElementById("drag").style.visibility = "visible";
			document.getElementById("contentClip").style.visibility = "visible";
		}
	}	
}