var upH = 13; // Height of up-arrow
var upW = 15; // Width of up-arrow
var downH = 13; // Height of down-arrow
var downW = 15; // Width of down-arrow
var dragH = 16; // Height of scrollbar
var dragW = 5; // Width of scrollbar
var scrollH1 = 287; // Height of scrollbar
var scrollH2 = 198; // Height of scrollbar //workshop
var limitT1 = 225; // Limit of scrollbar //curso
var limitT2 = 315; // Limit of scrollbar //workshop

var speed = 4; // 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){
	switch(layer) {
		case '1': scrollH = scrollH1;
				  break;
		case '2': scrollH = scrollH2;
				  break;
		}

	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){

	switch(layer) {
		case '1': scrollH = scrollH1;
			  	  rulerT = limitT1;
				  break;
		case '2': scrollH = scrollH2;
				  rulerT = limitT2;
  				  break;
		}
	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(layer);
		
		// 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(layer){

	numero =  layer.substr(layer.length-1,1);

	switch (numero)	{ 
		case '1':	
		if(ie4)
			contentT = document.all.content1.style.pixelTop;
		else if(nn4)
			contentT = document.contentClip1.document.content1.top;
		else if(dom)
			contentT = parseInt(document.getElementById("content1").style.top);
		break;
		
		case '2':	
		if(ie4)
			contentT = document.all.content2.style.pixelTop;
		else if(nn4)
			contentT = document.contentClip2.document.content2.top;
		else if(dom)
			contentT = parseInt(document.getElementById("content2").style.top);
		break;		
	}
}

// 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(layer){

	numero =  layer.substr(layer.length-1,1);

	switch (numero)	{ 
		case '1':	
		if(ie4){
			document.all.content1.style.top = contentT;
			document.all.ruler1.style.top = dragT;
			document.all.drag1.style.top = dragT;
		}
		else if(nn4){
			document.contentClip1.document.content1.top = contentT;
			document.ruler1.top = dragT;
			document.drag1.top = dragT;
		}
		else if(dom){
			document.getElementById("content1").style.top = contentT + "px";
			document.getElementById("drag1").style.top = dragT + "px";
			document.getElementById("ruler1").style.top = dragT + "px";
		}
		break;

		case '2':	
		if(ie4){
			document.all.content2.style.top = contentT;
			document.all.ruler2.style.top = dragT;
			document.all.drag2.style.top = dragT;
		}
		else if(nn4){
			document.contentClip2.document.content2.top = contentT;
			document.ruler2.top = dragT;
			document.drag2.top = dragT;
		}
		else if(dom){
			document.getElementById("content2").style.top = contentT + "px";
			document.getElementById("drag2").style.top = dragT + "px";
			document.getElementById("ruler2").style.top = dragT + "px";
		}
		break;		
	}
}

// Scrolls up
function scrollUp(){
	getT(layer);
	
	if(clickAbove){
		if(dragT <= (mouseY-(dragH/2)))
			return up();
	}
	
	if(clickUp){
		if(contentT < 0){		
			dragT = dragT - (speed*scrollLength) ;
//			if(dragT < (rulerT)){
//				dragT = rulerT;
//				}
			if(dragT < limitT){ //modificado
				dragT = limitT; //modificado
				} //modificado

		contentT = contentT + speed;
			if(contentT > 0)
				contentT = 0;

			moveTo(layer);
			timer = setTimeout("scrollUp()",25);
		}
	}
	return false;
}

// Scrolls down
function scrollDown(){

	switch(layer) {
		case '1': scrollH = scrollH1;
				  break;
		case '2': scrollH = scrollH2;
				  break;
		}
		
	getT(layer);
	
	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(layer);
			timer = setTimeout("scrollDown()",25);
		}
	}
	return false;
}

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

// Preload

function eventLoader(e){
	layer =  e.substr(e.length-1,1);

	switch (layer)	{ 
 			case '1' :
			limitT = limitT1;
			layer1();
			break;

 			case '2' :
			limitT = limitT2;
			layer2();
			break;

	}
}



function layer1(){
	switch(layer) {
		case '1': scrollH = scrollH1;
				  break;
		case '2': scrollH = scrollH2;
		 		   break;
		}
	if(ie4){
		// Up-arrow X and Y variables
		upL = document.all.up1.style.pixelLeft;
		upT = document.all.up1.style.pixelTop;		
		// Down-arrow X and Y variables
		downL = document.all.down1.style.pixelLeft;
		downT = document.all.down1.style.pixelTop;
		// Scrollbar X and Y variables
		dragL = document.all.drag1.style.pixelLeft;
		dragT = document.all.drag1.style.pixelTop;		
		// Ruler Y variable
		rulerT = document.all.ruler1.style.pixelTop;		
		// Height of content layer and clip layer
		contentH = parseInt(document.all.content1.scrollHeight);
		contentClipH = parseInt(document.all.contentClip1.style.height);
	}
	else if(nn4){
		// Up-arrow X and Y variables
		upL = document.up1.left;
		upT = document.up1.top;		
		// Down-arrow X and Y variables
		downL = document.down1.left;
		downT = document.down1.top;		
		// Scrollbar X and Y variables
		dragL = document.drag1.left;
		dragT = document.drag1.top;		
		// Ruler Y variable
		rulerT = document.ruler1.top;
		// Height of content layer and clip layer
		contentH = document.contentClip1.document.content1.clip.bottom;
		contentClipH = document.contentClip1.clip.bottom;
	}
	else if(dom){
		// Up-arrow X and Y variables
		upL = parseInt(document.getElementById("up1").style.left);
		upT = parseInt(document.getElementById("up1").style.top);
		// Down-arrow X and Y variables
		downL = parseInt(document.getElementById("down1").style.left);
		downT = parseInt(document.getElementById("down1").style.top);
		// Scrollbar X and Y variables
		dragL = parseInt(document.getElementById("drag1").style.left);
		dragT = parseInt(document.getElementById("drag1").style.top);
		// Ruler Y variable
		rulerT = parseInt(document.getElementById("ruler1").style.top);
		// Height of content layer and clip layer
		contentH = parseInt(document.getElementById("content1").offsetHeight);
		contentClipH = parseInt(document.getElementById("contentClip1").offsetHeight);
		document.getElementById("content1").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;
}

function layer2(){
	switch(layer) {
		case '1': scrollH = scrollH1;
				  break;
		case '2': scrollH = scrollH2;
				  break;
		}
	if(ie4){
		// Up-arrow X and Y variables
		upL = document.all.up2.style.pixelLeft;
		upT = document.all.up2.style.pixelTop;		
		// Down-arrow X and Y variables
		downL = document.all.down2.style.pixelLeft;
		downT = document.all.down2.style.pixelTop;
		// Scrollbar X and Y variables
		dragL = document.all.drag2.style.pixelLeft;
		dragT = document.all.drag2.style.pixelTop;		
		// Ruler Y variable
		rulerT = document.all.ruler2.style.pixelTop;		
		// Height of content layer and clip layer
		contentH = parseInt(document.all.content2.scrollHeight);
		contentClipH = parseInt(document.all.contentClip2.style.height);
	}
	else if(nn4){
		// Up-arrow X and Y variables
		upL = document.up2.left;
		upT = document.up2.top;		
		// Down-arrow X and Y variables
		downL = document.down2.left;
		downT = document.down2.top;		
		// Scrollbar X and Y variables
		dragL = document.drag2.left;
		dragT = document.drag2.top;		
		// Ruler Y variable
		rulerT = document.ruler2.top;
		// Height of content layer and clip layer
		contentH = document.contentClip2.document.content2.clip.bottom;
		contentClipH = document.contentClip2.clip.bottom;
	}
	else if(dom){
		// Up-arrow X and Y variables
		upL = parseInt(document.getElementById("up2").style.left);
		upT = parseInt(document.getElementById("up2").style.top);
		// Down-arrow X and Y variables
		downL = parseInt(document.getElementById("down2").style.left);
		downT = parseInt(document.getElementById("down2").style.top);
		// Scrollbar X and Y variables
		dragL = parseInt(document.getElementById("drag2").style.left);
		dragT = parseInt(document.getElementById("drag2").style.top);
		// Ruler Y variable
		rulerT = parseInt(document.getElementById("ruler2").style.top);
		// Height of content layer and clip layer
		contentH = parseInt(document.getElementById("content2").offsetHeight);
		contentClipH = parseInt(document.getElementById("contentClip2").offsetHeight);
		document.getElementById("content2").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;
}