// Known bugs :
// 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()

// 19.04.2001 - Finally able to remove browser-scrollbar if content is longer than the browser is high:
// Just put this in the style-tag right before the end head-tag:
// body {margin-left:0; margin-right:0; margin-top:0; margin-bottom:0; width:100%;height:100%;overflow:hidden}

// Touch me here :-)
var upH = 3; // Height of up-arrow
var upW = 2; // Width of up-arrow
var downH = 3; // Height of down-arrow
var downW = 2; // Width of down-arrow
var dragH = 15; // Height of scrollbar
var dragW = 15; // Width of scrollbar
var scrollH = 300; // Height of scrollbar
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 mX
var mY

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 layer_left
// var layer_top

function getXY(){
	var categoryimg = document.images['categoryImg'];
	if(document.layers) return categoryimg;

	var rd = {x:0,y:0};
	
	if(typeof(categoryimg) == "object"){
		do{
			rd.x += parseInt(categoryimg.offsetLeft); //return x-coords.
			rd.y += parseInt(categoryimg.offsetTop); //return y-coords.
			categoryimg = categoryimg.offsetParent;
		}while(categoryimg);

		rd.x += 147;
	}else{
		//rd.x = 230;
		//rd.y = 180;
		//alert(document.getElementById('mainCate'));
		var t_Menu = document.images['t_Menu'];
		do{
			rd.x += parseInt(t_Menu.offsetLeft); //return x-coords.
			rd.y += parseInt(t_Menu.offsetTop); //return y-coords.
			t_Menu = t_Menu.offsetParent;
		}while(t_Menu);
		rd.x += 200;
		rd.y += 80;
		//rd.x = 70;
		//rd.y = 100;
	}
	return rd;
}

function layer_view(_layer,e){
//   var layer_left =  e.pageX ? e.pageX : document.documentElement.scrollLeft+e.clientX;
//   var layer_top  =  e.pageY ? e.pageY : document.documentElement.scrollTop+e.clientY;
	var rd = getXY();
	var layer_left = rd.x;
	var layer_top = rd.y;

   document.getElementById(_layer).style.left = layer_left+"px";
   document.getElementById(_layer).style.top = layer_top+"px";

   mX = layer_left;
   mY = layer_top;

//  alert(layer_left)
   if( document.getElementById(_layer).style.display== "block"){
    document.getElementById(_layer).style.display="none";
   }else{
    document.getElementById(_layer).style.display="block";
   }
   eventLoader();
  }

// 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){
 // alert(layer_left)
  mouseY = (event.clientY + document.body.scrollTop) - mY;
  mouseX = (event.clientX + document.body.scrollLeft) - mX;
/*
  var rd = getXY();
  mouseX = rd.x - 350;
  mouseY = rd.y - 193;
*/
//  mouseY = event.clientY + document.body.scrollTop;
//  mouseX = event.clientX + document.body.scrollLeft;


// alert(Number(layer_top.value))
//  alert(mouseX)
//  alert(layer_left)
//  alert(mouseY)
  


 }
 else if(nn4 || dom){
  mouseY = e.pageY + mY;
  mouseX = e.pageX + mX;
//  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.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;
 }
 else if(dom){
  // Up-arrow X and Y variables
  upL = parseInt(document.getElementById("up").style.left);
  upT = parseInt(document.getElementById("up").style.top);
  // Down-arrow X and Y variables
  downL = parseInt(document.getElementById("down").style.left);
  downT = parseInt(document.getElementById("down").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;
}