//*****************************************************************************
// Scroller constructor.
//*****************************************************************************

function Scroller(x, y, width, height, border, padding) 
{
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.border = border;
this.padding = padding;

this.items = new Array();
this.created = false;

  // Set default colors.
this.fgColor = "#000000";
this.bgColor = "#ffffff";
this.bdColor = "#000000";

  // Set default font.
this.fontFace = "Arial,Helvetica";
this.fontSize = "2";

  // Set default scroll timing values.
this.speed = 50;
this.pauseTime = 2000;

  // Define methods.
this.setColors = scrollerSetColors;
this.setFont = scrollerSetFont;
this.setSpeed = scrollerSetSpeed;
this.setPause = scrollersetPause;
this.addItem = scrollerAddItem;
this.create = scrollerCreate;
this.show = scrollerShow;
this.hide = scrollerHide;
this.moveTo = scrollerMoveTo;
this.moveBy = scrollerMoveBy;
this.getzIndex = scrollerGetzIndex;
this.setzIndex = scrollerSetzIndex;
this.stop = scrollerStop;
this.start = scrollerStart;
}

//*****************************************************************************
// Scroller methods.
//*****************************************************************************

function scrollerSetColors(fgcolor, bgcolor, bdcolor) 
{
if (this.created) 
	{
	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.fgColor = fgcolor;
this.bgColor = bgcolor;
this.bdColor = bdcolor;
}

function scrollerSetFont(face, size) 
{
if (this.created) 
	{
    	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.fontFace = face;
this.fontSize = size;
}

function scrollerSetSpeed(pps) 
{
if (this.created) 
	{
    	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.speed = pps;
}

function scrollersetPause(ms) 
{
if (this.created) 
	{
    	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.pauseTime = ms;
}

function scrollerAddItem(str) 
{
if (this.created) 
	{
    	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.items[this.items.length] = str;
}

function scrollerCreate() 
{
var start, end;
var str;
var i, j;
var x, y;

if (!isMinNS4 && !ie && !dom)
    return;

  // On first scroller, start interval timer.
if (scrollerList.length == 0)
    setInterval('scrollerGo()', scrollerInterval);

  // Create the scroller only once.
if (this.created) 
	{
    	alert("Scroller Error: Scroller has already been created.");
    	return;
  	}

this.created = true;

  // Copy first item to the end of the list, this lets us scroll from the last
  // defined item to the first without jumping.
this.items[this.items.length] = this.items[0];

  // Set up HTML code for item text.
start = '<table border=0'
      + ' cellpadding=' + (this.padding + this.border)
      + ' cellspacing=0'
      + ' width=' + this.width
      + ' height=' + this.height + '>'
      + '<tr><td>'
      + '<font'
      + ' color="' + this.fgColor + '"'
      + ' face="' + this.fontFace + '"'
      + ' size=' + this.fontSize + '>';
end   = '</font></td></tr></table>';

  // Build the layers.
if (isMinNS4) 
	{
    	this.baseLayer = new Layer(this.width);
    	this.scrollLayer = new Layer(this.width, this.baseLayer);
    	this.scrollLayer.visibility = "inherit";
    	this.itemLayers = new Array();
    	for (i = 0; i < this.items.length; i++) 
		{
	      	this.itemLayers[i] = new Layer(this.width, this.scrollLayer);
      		this.itemLayers[i].document.open();
      		this.itemLayers[i].document.writeln(start + this.items[i] + end);
      		this.itemLayers[i].document.close();
      		this.itemLayers[i].visibility = "inherit";
    		}

    	  // Set background colors.
  	setBgColor(this.baseLayer, this.bdColor);
    	setBgColor(this.scrollLayer, this.bgColor);
  	}

if (ie||dom) 
	{
    	i = scrollerList.length;
    	str = '<div id="scroller' + i + '_baseLayer"'
            + ' style="position:absolute;'
            + ' background-color:' + this.bdColor + ';'
            + ' width:' + this.width + 'px;'
            + ' height:' + this.height + 'px;'
            + ' overflow:hidden;'
            + ' visibility:hidden;">\n'
            + '<div id="scroller' + i + '_scrollLayer"'
            + ' style="position:absolute;'
            + ' background-color: ' + this.bgColor + ';'
            + ' width:' + this.width + 'px;'
            + ' height:' + (this.height * this.items.length) + 'px;'
            + ' visibility:inherit;">\n';

    	for (j = 0; j < this.items.length; j++) 
		{
      		str += '<div id="scroller' + i + '_itemLayers' + j + '"'
          	    +  ' style="position:absolute;'
          	    +  ' width:' + this.width + 'px;'
          	    +  ' height:' + this.height + 'px;'
          	    +  ' visibility:inherit;">\n'
          	    +  start + this.items[j] + end
          	    +  '</div>\n';
    		}

    	str += '</div>\n'
            +  '</div>\n';

    	  // Insert HTML code at end of page. For IE4, need to scroll window to
    	  // end of page, insert and scroll back to correct bug.

    	if (!(ie&&window.print)) 
		{
      		x = getPageScrollX();
      		y = getPageScrollY();
      		window.scrollTo(getPageWidth(), getPageHeight());
    		}

	if (ie)
		{
    		document.all.tempholder.innerHTML = str;
		}
    	else if (dom)
		{
    		document.getElementById("tempholder").innerHTML = str;
		}
	
    	if (!(ie&&window.print))
      		window.scrollTo(x, y);

    	  // Get handles to each layer.
    	this.baseLayer = getLayer("scroller" + i + "_baseLayer");
    	this.scrollLayer = getLayer("scroller" + i + "_scrollLayer");
    	this.itemLayers = new Array();
    	for (j = 0; j < this.items.length; j++)
      		this.itemLayers[j] = getLayer("scroller" + i + "_itemLayers" + j);
  	}

  // Position and clip base and scroll layers.
moveLayerTo(this.baseLayer, this.x, this.y);
clipLayer(this.baseLayer, 0, 0, this.width, this.height);
moveLayerTo(this.scrollLayer, this.border, this.border);
clipLayer(this.scrollLayer, 0, 0, this.width - 2 * this.border, this.height - 2 * this.border);

  // Position and clip each item layer.
x = 0;
y = 0;
for (i = 0; i < this.items.length; i++) 
	{
    	moveLayerTo(this.itemLayers[i], x, y);
    	clipLayer(this.itemLayers[i], 0, 0, this.width, this.height);
    	y += this.height;
  	}

  // Set up scrolling parameters.
this.stopped = false;
this.currentY = 0;
this.stepY = this.speed / (1000 / scrollerInterval);
this.stepY = Math.min(this.height, this.stepY);
this.nextY = this.height;
this.maxY = this.height * (this.items.length - 1);
this.paused = true;
this.counter = 0;

  // Add to global list.
scrollerList[scrollerList.length] = this;

  // Display it.
showLayer(this.baseLayer);
}

function scrollerShow() 
{
if (this.created)
    showLayer(this.baseLayer);
}

function scrollerHide() 
{
if (this.created)
    hideLayer(this.baseLayer);
}

function scrollerMoveTo(x, y) 
{
if (this.created)
    moveLayerTo(this.baseLayer, x, y);
}

function scrollerMoveBy(dx, dy) 
{
if (this.created)
    moveLayerBy(this.baseLayer, dx, dy);
}

function scrollerGetzIndex() 
{
if (this.created)
    return(getzIndex(this.baseLayer));
else
    return(0);
}

function scrollerSetzIndex(z) 
{
if (this.created)
    setzIndex(this.baseLayer, z);
}

function scrollerStart() 
{
this.stopped = false;
}

function scrollerStop() 
{
this.stopped = true;
}

//*****************************************************************************
// Code for scrolling.
//*****************************************************************************

// An array is used to hold a pointer to each scroller that is defined. The
// scrollerGo() function runs at regular intervals and updates each scroller
// in this list.

var scrollerList     = new Array();
var scrollerInterval = 20;

function scrollerGo() 
{
var i;

  // Update each scroller object in the list.
for (i = 0; i < scrollerList.length; i++) 
	{
    	  // If stopped, skip.
   	if (scrollerList[i].stopped);
	  // If paused, update counter.
    	else if (scrollerList[i].paused) 
		{
      		scrollerList[i].counter += scrollerInterval;
      		if (scrollerList[i].counter > scrollerList[i].pauseTime)
        		scrollerList[i].paused = false;
    		}
   	else // Scroll it.
		{ 
      		scrollerList[i].currentY += scrollerList[i].stepY;

      		  // Pause it if the next item has scrolled into view.
      		if (scrollerList[i].currentY >= scrollerList[i].nextY) 
			{
        		scrollerList[i].paused = true;
        		scrollerList[i].counter = 0;
        		scrollerList[i].currentY = scrollerList[i].nextY;
        		scrollerList[i].nextY += scrollerList[i].height;
      			}

      		  // When we reach the end, start over.
      		if (scrollerList[i].currentY >= scrollerList[i].maxY) 
			{
        		scrollerList[i].currentY -= scrollerList[i].maxY;
        		scrollerList[i].nextY = scrollerList[i].height;
      			}

      		scrollLayerTo(scrollerList[i].scrollLayer, 0, Math.round(scrollerList[i].currentY), false);
    		}
  	}
}

//*****************************************************************************
// Code to handle a window resize.
//*****************************************************************************

// These variables are used to determine if a resize event is a true one.
// Necessary due to a bug in older NS4 releases.

var origWidth;
var origHeight;

// Fix for resize bug.

if (isMinNS4) 
	{
  	origWidth  = window.innerWidth;
  	origHeight = window.innerHeight;
	}

window.onresize = scrollerReload;

function scrollerReload() 
{
  // Reload page in case of a browser resize. First make sure it's a true
  // resize.

if (isMinNS4 && origWidth == window.innerWidth && origHeight == window.innerHeight)
    return;

window.location.href = window.location.href;
}