// Variables à changer
// script adapter au site arteval 12/10/2005

var upH = 14; // Hauteur de up-arrow
var upW = 17; // Largeur de up-arrow
var downH = 14; // Hauteur de down-arrow
var downW = 17; // Largeur de down-arrow
var dragH = 0; // Hauteur du dragbar
var dragW = 0; // Largeur du dragbar
var scrollH = 0; // Hauteur du scroll
var speed = 10; // Vitesse du scroll

var TargetLoc='espacetexte'; // positionement du layer
var decalTargetLocTop=80;     // décalage % au position du layer
var decalTargetLocLeft=45;     // décalage % au position du layer


// Ne rien Toucher à partir d'ici


var StartTop=0; 
var StartLeft=0;
 
var StartTopSousMenu=0; 
var StartLeftSousMenu=0; 

// 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 contentClipT; // Content clip Top
var contentClipL; // Content clip Left
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 - contentClipT;
		document.all.drag.style.top = dragT - contentClipT;
	}
	else if(nn4){
		document.contentClip.document.content.top = contentT;
		//document.ruler.top = dragT - contentClipT;
		document.drag.top = dragT - contentClipT;
	}
	else if(dom){
		document.getElementById("content").style.top = contentT + "px";
		document.getElementById("drag").style.top = eval(dragT - contentClipT) + "px";
		//document.getElementById("ruler").style.top = eval(dragT - contentClipT) + "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(ScrollVisible){
	// control l'apparition du scroll
	//showTypenav();
	if (ScrollVisible == 'noscroll'){hideScroll();}
	ClcTrgtInit();
	if(ie4){
		//alert("ie4:");
// Up-arrow X and Y variables
		contentClipT= parseInt(document.all.contentClip.style.top) ; // Content clip Top
        contentClipL =parseInt(document.all.contentClip.style.left) ; // Content clip Left
// Up-arrow X and Y variables
		upL = document.all.up.style.pixelLeft + contentClipL ;
		upT = document.all.up.style.pixelTop  + contentClipT ;		
// Down-arrow X and Y variables
		downL = document.all.down.style.pixelLeft + contentClipL;
		downT = document.all.down.style.pixelTop + contentClipT ;;
// Scrollbar X and Y variables
		dragL = document.all.drag.style.pixelLeft + contentClipL;
		dragT = document.all.drag.style.pixelTop  + contentClipT;		
// Ruler Y variable
		rulerT = document.all.ruler.style.pixelTop + contentClipT;		
// Height of content layer and clip layer
		contentH = parseInt(document.all.content.scrollHeight);
		contentClipH = parseInt(document.all.contentClip.style.height);
	}
	else if(nn4){
		//alert("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){
		///alert("Dom:");
		contentClipL =parseInt(document.getElementById("contentClip").style.left) ; // Content clip Left
		contentClipT= parseInt(document.getElementById("contentClip").style.top) ; // Content clip Top 
		// Up-arrow X and Y variables
		upL = parseInt(document.getElementById("up").style.left) + contentClipL;
		upT = parseInt(document.getElementById("up").style.top) + contentClipT;
// Down-arrow X and Y variables
		downL = parseInt(document.getElementById("down").style.left)  + contentClipL;
		downT = parseInt(document.getElementById("down").style.top) + contentClipT;
		

// Scrollbar X and Y variables
		dragL = parseInt(document.getElementById("drag").style.left) + contentClipL;
		dragT = parseInt(document.getElementById("drag").style.top) + contentClipT;
// Ruler Y variable
		rulerT = parseInt(document.getElementById("ruler").style.top)+ contentClipT;
// 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;
	
}

// Calculates StartTop and Left a l'initialisation par rapport a la targetLoc 
function ClcTrgtInit(){  
  //showTypenav(); 
  // calcul valeur le positionment relative du layer  de la page % a targetloc (ici location menu)    
  var TLoc=(nn4)? document.layers[TargetLoc]:(dom)?document.getElementById(TargetLoc):document.all[TargetLoc];
  StartTop+=(nn4)?TLoc.pageY:getTop(TLoc);
  StartLeft+=(nn4)?TLoc.pageX:getLeft(TLoc);
  //alert("StartTop:"+StartTop+"   StartLeft:"+ StartLeft);
  // position le layer contentclip
  document.getElementById("contentClip").style.top = eval(StartTop+ decalTargetLocTop)+"px";
  document.getElementById("contentClip").style.left = eval(StartLeft+decalTargetLocLeft)+"px";
  document.getElementById("contentClip").style.visibility='visible';
  
  }
  
 

  function ClcTrgt(){      // Calculates StartTop and Left when positioning is relative
  var TLoc=(nn4)? document.layers[TargetLoc]:(dom)?document.getElementById(TargetLoc):document.all[TargetLoc];
  var newStartTop  =(nn4)?TLoc.pageY:getTop(TLoc);
  var newStartLeft =(nn4)?TLoc.pageX:getLeft(TLoc);
  var diffStartTop =    newStartTop - StartTop;
  var diffStartLeft =   newStartLeft - StartLeft;
  StartTop = newStartTop;
  StartLeft = newStartLeft;
  
  var LeLeft = parseInt(document.getElementById("contentClip").style.left) + diffStartLeft;
  var LeTop = parseInt(document.getElementById("contentClip").style.top) + diffStartTop;
  document.getElementById("contentClip").style.left = LeLeft+"px";
  document.getElementById("contentClip").style.top = LeTop+"px";
  // Up-arrow X and Y variables
		upL +=  diffStartLeft;
		upT +=  diffStartTop ;		
// Down-arrow X and Y variables
		downL += diffStartLeft;
		downT += diffStartTop ; 
// le drag & le ruler
		dragL += diffStartLeft;
		dragT += diffStartTop ;
		rulerT+= diffStartTop; 
  }




function getLeft(l)
{
  if (l.offsetParent) return (l.offsetLeft + getLeft(l.offsetParent));
  else return (l.offsetLeft);
}
function getTop(l)
{ //showTypenav();
  if (l.offsetParent) return (l.offsetTop + getTop(l.offsetParent));
  else return (l.offsetTop);
}


function showScroll(){  
   document.getElementById("up").style.visibility='visible';
   document.getElementById("down").style.visibility='visible';
   //document.getElementById("drag").style.visibility='visible';
   //document.getElementById("ruler").style.visibility='visible';
  }

function hideScroll(){  
   document.getElementById("up").style.visibility='hidden';
   document.getElementById("down").style.visibility='hidden';
   document.getElementById("drag").style.visibility='hidden';
   document.getElementById("ruler").style.visibility='hidden';
  }
  
function showTypenav(){
var msgnav='';
if(ie4){msgnav+="  nav ie4";}
if(nn4){msgnav+="  Nav nn4";}
if(dom){msgnav+="  Nav Dom";}
alert(msgnav);

}