// Made by geeeet@ghtml.com
// Keep these two lines and you're free to use this code

// Known bugs :
// Not able to remove browser-scrollbar in netscape 6, if the span "content" is heigher than browserwindow... :-(
// If ie4.5 mac, please press apple-t to remove sidebar, otherwise everything is pushed 20px to the right...

// Corrected bugs :
// 25.01.2001 - When the height of the span "content" was less than the height of the span "contentClip" a javascript error occured, function changed : move()
// 21.02.2001 - Scrolling text wasn't selectable in ie, function changed : move()
// 05.03.2001 - Ie x and y coordinates was wrong when page was scrolled, function changed : getMouse()


//visibilitat de les fletxes
//declaracio dels layers
//ns4 = (document.layers)? true:false
//ie4 = (document.all)? true:false
if (parseInt(navigator.appVersion) >= 4) {
	if(navigator.appName == "Netscape") {
		if (navigator.appName.indexOf("MSIE 5")!=1&& parseInt(navigator.appVersion)>=5) {
			var dom=true;
			doc1 = "document.getElementById('";
			doc2 = "').style"
			vis = "visible";
			novis = "hidden";
			}
		else {
			var ns4=true;
			doc1 = "document.layers['";
			doc2 = "']";
			vis = "show";
			novis = "hide";
			}
		}
	else {
		var ie4=true;
		doc1 = "document.all['";
		doc2 = "'].style";
		vis = "visible";
		novis = "hidden";
	}
}

function navegador(){
	if (ns4) {
		ampladaF = window.innerWidth;
		fletxa1 = document.upF;
		fletxa2 = document.downF;
		txt = document.contentClip.document.content;
		dragV = document.drag;
		rulerV = document.ruler;
		clipV = document.contentClip;
		}
		
	if (ie4) {
		fletxa1 = upF.style;
		fletxa2 = downF.style;
		ampladaF = document.body.clientWidth;
		txt = content.style;
		dragV = drag.style;
		rulerV = ruler.style;
		clipV = contentClip.style;
		
		// inicio de los valores style para ie4
		txt.top = 0;
		txt.ypos = parseInt(txt.top);
		}
		
	if (dom) {
		ampladaF = window.innerWidth;
		fletxa1 = eval(doc1+"upF"+doc2);
		fletxa2 = eval (doc1+"downF"+doc2);
		txt = eval(doc1+"content"+doc2);
		dragV = eval(doc1+"drag"+doc2);
		rulerV = eval(doc1+"ruler"+doc2);
		clipV = eval (doc1+"contentClip"+doc2);
		}
	}
function fletxes (largo) {
	if (ns4) {yyy = txt.clip.bottom;}
	if (ie4) {yyy = document.all.content.scrollHeight;}
	if (dom) {yyy = parseInt(document.getElementById("content").offsetHeight);}
	
	// yyy es el largo real del texto,
	/* 'largo' es la altura del layer que contiene el text, a partir de la cual queremos que
	funcionen las flechas, valor más normal = altura del layer*/
	if (yyy > largo) {
	if (ns4) {fletxa1.visibility = "show"; fletxa2.visibility = "show";
		dragV.visibility = "show"; rulerV.visibility="show"; clipV.visibility="show";}
	if (ie4) {fletxa1.visibility = "visible"; fletxa2.visibility = "visible";
			dragV.visibility = "visible"; rulerV.visibility="visible"; clipV.visibility="visible";}
	if (dom) {fletxa1.visibility = "visible"; fletxa2.visibility = "visible";
			dragV.visibility = "visible"; rulerV.visibility="visible"; clipV.visibility="visible";}
	
	eventLoader();
	}	
	else {
		if (ns4) {fletxa1.visibility = "hide"; fletxa2.visibility = "hide";
				dragV.visibility = "hide"; rulerV.visibility="hide"; clipV.visibility="hide";}
		if (ie4) {fletxa1.visibility = "hidden"; fletxa2.visibility = "hidden";
				dragV.visibility="hidden"; rulerV.visibility="hidden";}
		if (dom) {fletxa1.visibility = "hidden"; fletxa2.visibility = "hidden";
				dragV.visibility="hidden"; rulerV.visibility="hidden";}
		}
	window.focus();
	}
//fi visibilitat de les fletxes


// Touch me here :-)
var upH = 8; // Height of up-arrow
var upW = 9; // Width of up-arrow
var downH = 8; // Height of down-arrow
var downW = 9; // Width of down-arrow
var dragH = 14; // Height of scrollbar
var dragW = 9; // Width of scrollbar
var scrollH = 244; // Height of scrollbar
var speed = 6; // Scroll speed

// And now... go to the bottom of the page...

// 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

// 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(ie4){
		// Up-arrow X and Y variables
		upL = document.all.upF.style.pixelLeft;
		upT = document.all.upF.style.pixelTop;		
		// Down-arrow X and Y variables
		downL = document.all.downF.style.pixelLeft;
		downT = document.all.downF.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.upF.left;
		upT = document.upF.top;		
		// Down-arrow X and Y variables
		downL = document.downF.left;
		downT = document.downF.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;
	}
	else if(dom){
		// Up-arrow X and Y variables
		upL = parseInt(document.getElementById("upF").style.left);
		upT = parseInt(document.getElementById("upF").style.top);
		// Down-arrow X and Y variables
		downL = parseInt(document.getElementById("downF").style.left);
		downT = parseInt(document.getElementById("downF").style.top);
		// Scrollbar X and Y variables
		dragL = parseInt(document.getElementById("drag").style.left);
		dragT = parseInt(document.getElementById("drag").style.top);
		// Ruler Y variable
		rulerT = parseInt(document.getElementById("ruler").style.top);
		// 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";
		
	}
	// 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;
	}
	document.onmousedown = down;
	document.onmousemove = move;
	document.onmouseup = up;
}