// SCROLLER VARIABLES
var scrollTimer = new Array();	// timeouts for each scrolling object
var fps=100, deltaT = 100/fps;	// fps = frames per second; deltaT in millisecs
var contHeight = 165;			// height of scroll clipping area


// SCROLLER START
function scrollInit()
{
  scroller = new makeScrollObj('scroller','content','container');
}

function makeScrollObj(objId,layerId,parent)
{
  if (document.getElementById)
  {
    this.style = document.getElementById(layerId).style; 
    this.style.top=0;
    this.unit = 'px';
    this.scrollHeight = document.getElementById(layerId).offsetHeight;
  }
  else if (document.all)
  {
    this.style = eval('document.all.'+layerId+'.style');
    this.style.top=0;
    this.unit = 'px';	
    this.scrollHeight = eval('document.all.'+layerId+'.offsetHeight');
  }
  else if (document.layers)
  {
    parent=(parent)? 'document.'+parent+'.':'';
    this.style = eval(parent+'document.'+layerId);
    this.unit = '';
    this.scrollHeight = this.style.document.height;	
  }

  this.id = objId;
  this.top = getTop;
  this.setTop = setTop;
}

function getTop()
{
  return parseInt(this.style.top);
}

function setTop(y)
{
  this.style.top=y+this.unit;
}

function scroll(obj,vy)
{
  if (scrollTimer[obj.id]) clearTimeout(scrollTimer[obj.id]);
  py=obj.top();
  py+=vy; yMin=0; yMax=contHeight-obj.scrollHeight;

  if(py<yMax){py=yMax;vy=0;} if(py>yMin){py=yMin;vy=0;}
  obj.setTop(py);
  if (vy!=0) scrollTimer[obj.id]=setTimeout("scroll("+obj.id+","+vy+")",deltaT);
}

function noScroll(obj)
{
  if (scrollTimer[obj.id]) clearTimeout(scrollTimer[obj.id]);
}