function init_grand() {
  var scroller4 = new Bs_ScrollableDiv();
  scroller4.init('divContainer_4', 'divContent_4');
  
  var sliderObj4 = new Bs_Slider();
  sliderObj4.attachOnChange(Bs_ScrollableDiv_sliderChange);
  sliderObj4.width          = 10;
  sliderObj4.height         = 'auto';
  sliderObj4.arrowMouseOver = true;
  sliderObj4.valueDefault   = 0; //start top position. this is in percent.
  sliderObj4.direction      = 1;
  sliderObj4.imgDir         = '/images/';
  sliderObj4.setBackgroundImage('barre_defilement.gif', '0 0 repeat-y');
  sliderObj4.setSliderIcon('curseur.gif', 10, 4);
  sliderObj4.setArrowIconLeft('fleche_haut.gif', 10, 8);
  sliderObj4.setArrowIconRight('fleche_bas.gif', 10, 8);
  sliderObj4.useInputField = 0;
  
  scroller4.setSliderObject(sliderObj4, 'sliderDiv4');
  scroller4.setSlideSpeed(220, 'pixel'); //50 pixel per second
  scroller4.setWheelSpeed(14, 'pixel'); //20 pixel per tick
}