scrollerObj.ar = new Array();

// left, top, width, height, alignment of content, id of container (if rel-pos)

function scrollerObj(x,y,w,h,al,hld)
{
  this.x=x||0; this.y=y||0; this.w=w; this.h=h; 
  this.al = al || "left"; this.hld = hld;
  this.ctr=1; this.items=new Array(); this.timerId=0;
  
  // defaults

  this.pause = 4000;	// how long to pause on messages
  this.spd   = 55;	// frequency of calls to scroll
  this.inc   = 3;	// how much to scroll per call
  this.fontFam = "verdana, helvetica, arial, sans-serif";
  this.fontSz  = "12px";
  this.fontClr = "#000000";
}

function addScrollerItem(txt,url)
{
  this.items[this.items.length] = new Array(txt,url);
}

function setScrollerFont(fam,sz,clr)
{
  this.fontFam=fam; this.fontSz=sz; this.fontClr=clr;
}

function setScrollerTiming(pause,spd,inc)
{
  this.pause=pause; this.spd=spd; this.inc=inc;
}

function createScroller()
{
  if (this.created) return;
  // rewrite 1st item to last
  this.items[this.items.length] = this.items[0];
  scrollerObj.ar[scrollerObj.ar.length] = this;	// add it to global list of scrollers
  this.obj = "scrollerObj"+scrollerObj.ar.length; eval(this.obj + "=this"); 
  // separate functions for assembling content
  if (document.layers) this.buildN4();
  else this.build();
  this.created = true;
}

function buildScroller()
{
  var elem, str;
  // scrWndo
  if (document.getElementById && document.createElement)
  {
    elem = document.createElement("div");
    // if rel-pos
    if (typeof this.hld != "undefined")
    {
      this.holder = document.getElementById(this.hld);
      this.scrWndo = this.holder.appendChild(elem);
    }
    else
    {
      this.scrWndo = document.body.appendChild(elem);
    }
    this.scrWndo.id = "scrWndo"+scrollerObj.ar.length;
    this.scrWndo.style.position = "absolute";
    this.scrWndo.style.visibility = "hidden";
  }
  else if (document.all)
  {
    str = '<div id="scrWndo'+scrollerObj.ar.length+'" style="position:absolute; visibility:hidden; "></div>';
    // if rel-pos
    if (typeof this.hld != "undefined")
    {
      this.holder = document.all[this.hld];
      if (typeof this.holder.innerHTML != "undefined")
        this.holder.innerHTML = str;
    }
    else
    {
      document.body.insertAdjacentHTML("beforeEnd",str);
    }
  }
  this.scrWndo = new dynObj("scrWndo"+scrollerObj.ar.length,this.x,this.y,this.w,this.h);
  with (this.scrWndo.css)
  {
    clip = "rect(0px, "+this.w+"px, "+this.h+"px, 0px)";
    overflow = "hidden"; zIndex=1000;	
  } 
  // set up scrolling content layer (scrCont)
  if (document.getElementById && document.createElement)
  {
    elem = document.createElement("div");
    this.scrCont = this.scrWndo.el.appendChild(elem);
    this.scrCont.id = "scrCont" + scrollerObj.ar.length;
    this.scrCont.style.position = "absolute";
  }
  else if (document.all)
  {
    var str = '<div id="scrCont'+scrollerObj.ar.length+'" style="position:absolute"></div>';
    this.scrWndo.writeLyr(str);
  }
  this.scrCont = new dynObj("scrCont"+scrollerObj.ar.length);
  this.scrCont.css.visibility = "inherit"; 
  this.scrCont.css.zIndex=1;
  this.scrCont.shiftTo(0,0);
  this.wrapItems();
  this.scrWndo.show();
  this.timerId = setTimeout(this.obj + ".controlScroll()",this.pause);
}

// assemble and write scroller content html 
function wrapItems()
{
  var itemStart, itemEnd, str = "";
  // to format items centered vertically and horizontally
  if (this.al == "center")
  {
    itemStart = '<table width="' + this.w + '" cellpadding="0" cellspacing="0" border="0"><tr><td style="text-align:center; height:' + this.h + 'px" valign="middle">';
    itemEnd = '</td></tr></table>';
    // to format left aligned content
  }
  else if (this.al == "left")
  {
    itemStart = '<div style="height:' + this.h + 'px">';
    itemEnd = '</div>';
  }
  for (var i=0; i<this.items.length; i++)
  {
    if (typeof this.items[i][1] != "undefined")  // if item has url
    {
      str += itemStart + '<a style="text-decoration:none; font-family:'+this.fontFam+'; font-size:'+this.fontSz+'; color:'+this.fontClr+'" href="'+ this.items[i][1] + '">' + this.items[i][0] + '</a>' + itemEnd;
    }
    else  // no url, wrap in span with styles attached
    {
      str += itemStart + '<div style="font-family:'+this.fontFam+'; font-size:'+this.fontSz+'; color:'+this.fontClr+'">' + this.items[i][0] + '</div>' + itemEnd;
    }
  }
  this.scrCont.writeLyr(str);
}

function buildScrollerNS4()
{
  // create wndo layer  
  if (typeof this.hld != "undefined")
  {
    this.holder = getLyrRef(this.hld,document);
    this.scrWndo = new Layer(this.w,this.holder);
  }
  else this.scrWndo = new Layer(this.w);
  this.scrWndo.resizeTo(this.w,this.h);
  this.scrWndo.moveTo(this.x,this.y);

  // create the scrolling content layer 
  var str = '<div id="scrCont'+scrollerObj.ar.length+'" style="position:absolute"></div>';
  this.scrWndo.document.write(str);
  this.scrWndo.document.close();
  this.scrCont = new dynObj("scrCont"+scrollerObj.ar.length);
  this.scrCont.css.visibility = "inherit"; 
  this.scrCont.css.zIndex=1;
  this.scrCont.shiftTo(0,0);
  this.wrapNS4Items();
  this.scrWndo.visibility = "show";
  this.timerId = setTimeout(this.obj + ".controlScroll()",this.pause);
}

function wrapNS4Items()
{
  var itemStart, itemEnd, str = "";
  if (this.al=="center") this.v = "middle";
  else this.v = "top";
  itemStart = '<table width="' + this.w + '" cellpadding="0" cellspacing="0" border="0"><tr><td align="'+this.al+'" height="' + this.h + '" valign="'+this.v+'">';
  itemEnd = '</td></tr></table>';
  for (var i=0; i<this.items.length; i++)
  {
    if (typeof this.items[i][1] != "undefined")  // if item has url
    {
      str += itemStart + '<a style="text-decoration:none; font-family:'+this.fontFam+'; font-size:'+this.fontSz+'; color:'+this.fontClr+'" href="'+ this.items[i][1] + '">' + this.items[i][0] + '</a>' + itemEnd;
    }
    else  // no url, wrap in span with styles attached
    {
      str += itemStart + '<div style="font-family:'+this.fontFam+'; font-size:'+this.fontSz+'; color:'+this.fontClr+'">' + this.items[i][0] + '</div>' + itemEnd;
    }
  }
  this.scrCont.writeLyr(str);
}

function controlScroll()
{
  if (this.ctr>this.items.length-1) this.startOver();
  else
  {
    var y = parseInt(this.scrCont.css.top);
    if (y> -this.h * this.ctr)
    { 
      this.scrCont.shiftBy(0,-this.inc);	
      this.timerId = setTimeout(this.obj+".controlScroll()",this.spd);	
    }
    else
    {
      this.ctr++;
      this.timerId = setTimeout(this.obj+".controlScroll()",this.pause);	
    }
  }
}

// restore scroller top to 0 and counter variable to 1
function startOver()
{
  this.ctr = 1;
  this.scrCont.shiftTo(0,0);
  this.controlScroll();	
}

scrollerObj.prototype.addItem = addScrollerItem;
scrollerObj.prototype.create = createScroller;
scrollerObj.prototype.setFont = setScrollerFont; 
scrollerObj.prototype.setTiming = setScrollerTiming;
scrollerObj.prototype.buildN4 = buildScrollerNS4; 
scrollerObj.prototype.build = buildScroller;
scrollerObj.prototype.wrapItems = wrapItems;
scrollerObj.prototype.wrapNS4Items = wrapNS4Items;
scrollerObj.prototype.controlScroll = controlScroll;
scrollerObj.prototype.startOver = startOver;

// remove layers from table for ns6+/mozilla (overflow/clip bug?)
function positionGecko()
{
  if (navigator.userAgent.indexOf("Gecko")>-1)
  {
    for (var i=0; i<scrollerObj.ar.length; i++)
    {
      if (scrollerObj.ar[i].holder)
      {
	scrollerObj.ar[i].holder.removeChild(scrollerObj.ar[i].scrWndo.el);
	document.body.appendChild(scrollerObj.ar[i].scrWndo.el);
	scrollerObj.ar[i].scrWndo.css.zIndex = 1000;
        var x = scrollerObj.ar[i].holder.offsetLeft + scrollerObj.ar[i].x;
	var y = scrollerObj.ar[i].holder.offsetTop + scrollerObj.ar[i].y;
	scrollerObj.ar[i].scrWndo.shiftTo(x,y);
      }
    }
  }
}

// ns6+/mozilla need to reposition layers onresize
function rePosGecko()
{
  for (var i=0; i<scrollerObj.ar.length; i++)
  {
    var x = scrollerObj.ar[i].holder.offsetLeft + scrollerObj.ar[i].x;
    var y = scrollerObj.ar[i].holder.offsetTop + scrollerObj.ar[i].y;
    scrollerObj.ar[i].scrWndo.shiftTo(x,y);
  }
}

function setMouseEvents()
{
  for (var i=0; i<scrollerObj.ar.length; i++)
  {
    scrollerObj.ar[i].scrCont.el.onmouseover = new Function("haltScroll("+i+")")
    scrollerObj.ar[i].scrCont.el.onmouseout = restartScroll;
  }
}

function haltScroll(num)
{
  clearTimeout(scrollerObj.ar[num].timerId);
}

function restartScroll(e)
{
  // get numeric portion of id (after scrCont)
  var num = parseInt(this.id.slice(7)) - 1;
  e = e? e: window.event? window.event: "";
  if (e)
  {
    var current = this;
    var related =  e.relatedTarget? e.relatedTarget: e.toElement? e.toElement: "";
    if (related)
    {
      if (current != related && !contains(current, related)) 
      scrollerObj.ar[num].controlScroll();
    }
    else scrollerObj.ar[num].controlScroll(); // ns4
  }
}

// adapted from http://www.brainjar.com/dhtml/events/default6.asp
function contains(a, b)
{
  // extra checks in case alt-tab away while over menu
  if (b && b.parentNode)
  {
    // Return true if node a contains node b.
    while (b.parentNode)
      if ((b = b.parentNode) == a)
        return true;
    return false;
  }
  else if (b && b.parentElement)
  {
    while (b.parentElement)
      if ((b = b.parentElement) == a)
        return true;
    return false;
  }
}