function jsScroll(id, height, width, scrollAmount, scrollDelay, direction, behavior, html) {
    this.id            = id;
    this.scrollAmount  = scrollAmount ? scrollAmount : 6;
    this.scrollDelay   = scrollDelay ? scrollDelay : 85;
    this.direction     = direction ? direction.toLowerCase() : 'left';  
    this.behavior      = behavior ? behavior.toLowerCase() : 'scroll';  
    this.name          = 'jsScroll_' + (++jsScroll._name);
    this.runId         = null;
    this.html          = html;
    this.isHorizontal = ('up,down'.indexOf(this.direction) == -1);
    
    var NowPos = 0;

    if (typeof(height) == 'number') {
        this.height = height;
        this.heightUnit = 'px';
    } else if (typeof(height) == 'string') {
        this.height = parseInt('0' + height, 10);
        this.heightUnit = height.toLowerCase().replace(/^[0-9]+/, '');
    } else {
        this.height = 100;
        this.heightUnit = 'px';
    }

    if (typeof(width) == 'number') {
        this.width = width;
        this.widthUnit = 'px';
    } else if (typeof(width) == 'string') {
        this.width = parseInt('0' + width, 10);
        this.widthUnit = width.toLowerCase().replace(/^[0-9]+/, '');
    } else {
        this.width = 100;
        this.widthUnit = 'px';
    }

    // jsScroll UI events
    this.onmouseover   = null;
    this.onmouseout    = null;
    this.onclick       = null;
    this.onscroll      = null;
    // jsScroll state events
    this.onstart       = null;
    this.onbounce      = null;
    this.onscroll      = null;

    var markup = '';

    if (document.layers) {
        markup = '<ilayer id="' + this.id + 'container" name="' + this.id + 'container" ' +
            'height="' + height + '" ' +
            'width="' + width + '"  ' +
            'clip="' + width + ', ' + height + '" ' +
            '>' + 
            '<\/ilayer>';
    } else if (document.body && typeof(document.body.innerHTML) != 'string') {
        markup = '<div id="' + this.id + 'container" name="' + this.id + 'container" ' +
            'style="position: relative; overflow: scroll; ' + 
            'height: ' + this.height + this.heightUnit + '; ' +
            'width: ' + this.width + this.widthUnit + '; ' +
            'clip: rect(0px, ' + this.width + this.widthUnit + ', ' + this.height + this.heightUnit + ', 0px); ' +
            '">' + 
            '<div id="' + this.id + '" style="position:relative;' + 
            (this.isHorizontal ? 'width:0px;' : '') + // if we scroll horizontally, make the text container as small as possible
            '">' +
            (this.isHorizontal ? '<nobr>' : '') +
            this.html +
            (this.isHorizontal ? '<\/nobr>' : '') +
            '<\/div>' +
            '<\/div>';
    } else {
        markup = '<div id="' + this.id + 'container" name="' + 
            this.id + 'container" ' +
            'style="position: relative; overflow: hidden; ' + 
            'height: ' + this.height + this.heightUnit + '; ' +
            'width: ' + this.width + this.widthUnit + '; ' +
            'clip: rect(0px, ' + this.width + this.widthUnit + ', ' + this.height + this.heightUnit + ', 0px); ' +
            '">' + 
            '<\/div>';
    }
    document.write(markup);
    window[this.name] = this;
}

// Class Properties/Methods

jsScroll._name = -1;

jsScroll._getInnerSize = function(elm, propName) {
    var val = 0;
    if (document.layers) {
        // navigator 4
        val = elm.document[propName];
    } else if (elm.style && typeof(elm.style[propName]) == 'number') {
        // opera
        // bug in Opera 6 width/offsetWidth. Use clientWidth
        if (propName == 'width' && typeof(elm.clientWidth) == 'number') {
            val = elm.clientWidth;
        } else {
            val =  elm.style[propName];
        }
    } else {
        //mozilla and IE
        switch (propName) {
            case 'height':
                if (typeof(elm.offsetHeight) == 'number')
                    val =  elm.offsetHeight;
                    break;
            case 'width':
                if (typeof(elm.offsetWidth) == 'number')
                    val = elm.offsetWidth;
                    break;
        }
    }
    return val;
};

jsScroll.getElm = function(id) {
    var elm = null;
    if (document.getElementById) {
        elm = document.getElementById(id);
    } else {
        elm = document.all[id];
    }
    return elm;
}

jsScroll.dispatchUIEvent = function (event, marqueeName, eventName) {
    var marquee = window[marqueeName];
    var eventAttr = 'on' + eventName;
    if (!marquee) {
        return false;
    }
    if (!event && window.event) {
        event = window.event;
    }
    switch (eventName) {
        case 'mouseover':
        case 'mouseout':
        
        case 'click':
        if (marquee[eventAttr])
            return marquee['on' + eventName](event);
    }
    return false;
};

jsScroll.createDispatchEventAttr = function (marqueeName, eventName) {
    return 'on' + eventName + '="jsScroll.dispatchUIEvent(event, \'' + marqueeName + '\', \'' + eventName + '\')" ';
};

// Instance properties/methods

jsScroll.prototype.start = function ()
{
  var markup = '';

  this.stop();

  if (!this.dirsign)
  {
    if (!document.layers)
    {
      this.containerDiv = jsScroll.getElm(this.id + 'container');

      if (typeof(this.containerDiv.innerHTML) != 'string')
      {
        return;
      }

      // adjust the container size before inner div is filled in
      // so IE will not hork the size of percentage units 
      var parentNode    = null;
      if (this.containerDiv.parentNode)
        parentNode = this.containerDiv.parentNode;
      else if (this.containerDiv.parentElement)
        parentNode = this.containerDiv.parentElement;

      if (parentNode && 
          typeof(parentNode.offsetHeight) == 'number' && 
          typeof(parentNode.offsetWidth) == 'number')
      {
        if (this.heightUnit == '%')
        {
          this.containerDiv.style.height = 
          parentNode.offsetHeight * (this.height/100) + 'px';
        }

        if (this.widthUnit == '%')
        {
          this.containerDiv.style.width = 
          parentNode.offsetWidth * (this.width/100) + 'px';
        }
      }

      markup += '<div id="' + this.id + '" name="' + this.id + '" ' +
        'style="position:relative; visibility: hidden;' +
        (this.isHorizontal ? 'width:0px;' : '') + // if we scroll horizontally, make the text container as small as possible
        '" ' +
        jsScroll.createDispatchEventAttr(this.name, 'mouseover') +
        jsScroll.createDispatchEventAttr(this.name, 'mouseout') +
        jsScroll.createDispatchEventAttr(this.name, 'click') +
    
        '>' +
        (this.isHorizontal ? '<nobr>' : '') +
        this.html +
        (this.isHorizontal ? '<\/nobr>' : '') +
        '<\/div>';

      this.containerDiv.innerHTML = markup;
      this.div                    = jsScroll.getElm(this.id);
      this.styleObj     = this.div.style;

    }
    else /* if (document.layers) */
    {
      this.containerDiv = document.layers[this.id + 'container'];
      markup = 
        '<layer id="' + this.id + '" name="' + this.id + '" top="0" left="0" ' +
        jsScroll.createDispatchEventAttr(this.name, 'mouseover') +
        jsScroll.createDispatchEventAttr(this.name, 'mouseout') +
        jsScroll.createDispatchEventAttr(this.name, 'click') +
       
        '>' +
        (this.isHorizontal ? '<nobr>' : '') + 
        this.html +
        (this.isHorizontal ? '<\/nobr>' : '') +
        '<\/layer>';

      this.containerDiv.document.write(markup);
      this.containerDiv.document.close();
      this.div          = this.containerDiv.document.layers[this.id];
      this.styleObj     = this.div;
    }

    // Start must not run until the page load event has fired
    // due to Internet Explorer not setting the height and width of 
    // the dynamically written content until then
    switch (this.direction)
    {
    case 'down':
      this.dirsign = 1;
      this.startAt = -jsScroll._getInnerSize(this.div, 'height');
      this._setTop(this.startAt);

      if (this.heightUnit == '%')
        this.stopAt = this.height * jsScroll._getInnerSize(this.containerDiv, 'height') / 100;
      else
        this.stopAt  = this.height;

      break;

    case 'up':
      this.dirsign = -1;

      if (this.heightUnit == '%')
        this.startAt = this.height * jsScroll._getInnerSize(this.containerDiv, 'height') / 100;
      else     
        this.startAt = this.height;

      this._setTop(this.startAt);
      this.stopAt  = -jsScroll._getInnerSize(this.div, 'height');

      break;

    case 'right':
      this.dirsign = 1;
      this.startAt = -jsScroll._getInnerSize(this.div, 'width');
      this._setLeft(this.startAt);

      if (this.widthUnit == '%')
        this.stopAt = this.width * jsScroll._getInnerSize(this.containerDiv, 'width') / 100;
      else    
        this.stopAt  = this.width;

      break;

    case 'left':
    default:
      this.dirsign = -1;

      if (this.widthUnit == '%')
        this.startAt = this.width * jsScroll._getInnerSize(this.containerDiv, 'width') / 100;
      else  
        this.startAt = this.width

      this._setLeft(this.startAt);
      this.stopAt  = -jsScroll._getInnerSize(this.div,'width');

      break;
    }
    this.newPosition          = this.startAt;
    this.styleObj.visibility = 'visible'; 
  }

  this.newPosition += this.dirsign * this.scrollAmount;

  if ( (this.dirsign == 1  && this.newPosition > this.stopAt) ||
       (this.dirsign == -1 && this.newPosition < this.stopAt) )
  {
    if (this.behavior == 'alternate')
    {
      if (this.onbounce)
      {
        // fire bounce when alternate changes directions
        this.onbounce();
      }
      this.dirsign = -this.dirsign;
      var temp     = this.stopAt;
      this.stopAt  = this.startAt;
      this.startAt = temp;
    }
    else
    {
      // fire start when position is a start
      if (this.onstart)
      {
        this.onstart();
      }
      this.newPosition = this.startAt;
    }
  }
  
  switch(this.direction)
  {
    case 'up': 
    case 'down':
      this._setTop(this.newPosition);
      break;

    case 'left': 
    case 'right':
    default:
      this._setLeft(this.newPosition);
      break;
  }

  this.runId = setTimeout(this.name + '.start()', this.scrollDelay);
  NowPos = this.newPosition;
  if (this.onscroll) {
    this.onscroll();
  }
};

jsScroll.prototype.stop = function () {
    if (this.runId)
        clearTimeout(this.runId);
        this.runId = null;
};

jsScroll.prototype.pos = function() { return NowPos;}

jsScroll.prototype.setInnerHTML = function (html) {
    if (typeof(this.div.innerHTML) != 'string') {
        return;
    }
    var running = false;
    if (this.runId) {
        running = true;
        this.stop();
    }
    this.html = html;
    this.dirsign = null;
    if (running) {
        this.start();
    }
};

// fixes standards mode in gecko
// since units are required

if (document.layers) {
    jsScroll.prototype._setLeft = function (left) {
        this.styleObj.left = left;
    };

    jsScroll.prototype._setTop = function (top) {
        this.styleObj.top = top;
    };
} else {
    jsScroll.prototype._setLeft = function (left) {
        this.styleObj.left = left + 'px';
    };

    jsScroll.prototype._setTop = function (top) {
        this.styleObj.top = top + 'px';
    };
}