//////////////////////////////////////////////////
/////////// MENU FLOTTANT - MOUVEMENT ////////////
//////////////////////////////////////////////////

function Add_Event(obj_, event_, func_, mode_) {
	if (obj_.addEventListener) obj_.addEventListener(event_, func_, mode_? mode_:false);
	else obj_.attachEvent('on'+event_, func_);
}

//----------------------------------------------//

function GetScrollPage(){
	
	var Top;
	var DocRef;

	if (window.innerWidth) {
		with (window) {
			Top = pageYOffset;
    	}
  	}
  	
  	else { // cas IneternetExplorer a part
    	if (document.documentElement && document.documentElement.clientWidth) DocRef = document.documentElement;
    	else DocRef = document.body;
		with (DocRef){
      		Top = scrollTop;
    	}
  	}
  	
  	return({top:Top});
}

//----------------------------------------------//

function ObjGetPosition(obj_) {

  	var PosY = 0;
  
  	//-- suivant type en parametre
  	if (typeof(obj_)=='object') var Obj=obj_;
  	else var Obj=document.getElementById( obj_);
  	
  	//-- si l'objet existe
  	if (Obj) {
    	//-- Recup. Position Objet
       	PosY = Obj.offsetTop;
    	//-- Si propriete existe
    	if (Obj.offsetParent) {
      		//-- Tant qu'un parent existe
      		while (Obj = Obj.offsetParent) {
        		if (Obj.offsetParent){ // on ne prend pas le BODY
          			//-- Ajout position Parent
          			PosY += Obj.offsetTop;
        		}
      		}
    	}
  	}
  	
  	//-- Retour des positions
  	return({top:PosY});
}

//----------------------------------------------//

var IdTimer_1;
var IdTimer_2;
var O_DivScroll;
var Rapport = 1.0/20.0;  // On divise par 20
var Mini = 2*Rapport;

//----------------------------------------------//

function DIV_Scroll(id_) {
	
  	var Obj = document.getElementById(id_);
  	this.Obj = Obj;
  	
  	if (Obj) {
    	Obj.style.position = "absolute"; // IMPERATIF
    	//-- Recup position de depart
    	var Pos = ObjGetPosition(id_);
    	this.PosY = Pos.top;
    	this.DebY = this.PosY;
    	this.NewY = 0;
    	this.Move = DIV_Deplace;
  	}
}

//----------------------------------------------//

function DIV_Deplace(y_) {
  	if (arguments[0] != null) {
    	this.PosY = y_;
    	this.Obj.style.top  = parseInt(y_) + "px";
  }
}

//----------------------------------------------//

function DIV_Replace(y_){
	
  	//-- Calcul Delta deplacement
  	var Delta_Y = (y_ -O_DivScroll.PosY) * Rapport;
  	
  	//-- Test si fin deplacement
  	if (( Delta_Y < Mini) && ( Delta_Y > -Mini)) {
    	clearInterval(IdTimer_1);
    	O_DivScroll.Move( y_);
  	}
  	
  	else {
    	O_DivScroll.Move( O_DivScroll.PosY + Delta_Y);
  }
}

//----------------------------------------------//

function DIV_CheckScroll() {
  
  	var Scroll = GetScrollPage();
  	
  	//-- New position du menu
  	O_DivScroll.NewY = Scroll.top  + O_DivScroll.DebY;
  
  	//-- Si pas la bonne Position
  	if (O_DivScroll.PosY != O_DivScroll.NewY) {
    	//-- Clear l'encours
    	clearInterval( IdTimer_1);
    	IdTimer_1 = setInterval("DIV_Replace(" + O_DivScroll.NewY + ")", 10);
  	}
  	
  return(true);
}

//----------------------------------------------//

function DIV_InitScroll() {
  	
  	//-- Recup position Objet
  	O_DivScroll = new DIV_Scroll('DIV_MOVE');
  
  	//-- Lance inspection si existe
  	if(O_DivScroll.Obj) IdTimer_2 = setInterval('DIV_CheckScroll()',100);
}

//========================================
Add_Event( window, 'load', DIV_InitScroll);
//-- EOF --