// JScript File

function verifyCompatibleBrowser(){ 
    this.ver = navigator.appVersion;
    this.dom = document.getElementById ? 1 : 0 ;
    this.ie5 = (this.ver.indexOf("MSIE 5") > -1 && this.dom) ? 1 : 0; 
    this.ie4 = (document.all && !this.dom) ? 1 : 0; 
    this.ns5 = (this.dom && parseInt(this.ver) >= 5) ? 1 : 0; 
 
    this.ns4 = (document.layers && !this.dom) ? 1 : 0; 
    this.bw = (this.ie5 || this.ie4 || this.ns4 || this.ns5);
    return this; 
} 

bw = new verifyCompatibleBrowser();
 
var speed = 50;
 
var loop, timer;
 
function ConstructObject(obj,nest){ 
    nest = (!nest) ? '':'document.'+nest+'.';
    this.el = bw.dom ? document.getElementById(obj):bw.ie4?document.all[obj] : bw.ns4?eval(nest+'document.'+obj) : 0;
    this.css = bw.dom ? document.getElementById(obj).style : bw.ie4?document.all[obj].style:bw.ns4 ? eval(nest+'document.'+obj) : 0; 
    this.scrollHeight = bw.ns4 ? this.css.document.height:this.el.offsetHeight;
    this.clipHeight = bw.ns4 ? this.css.clip.height:this.el.offsetHeight 
    this.up = MoveAreaUp;
	this.down = MoveAreaDown; 
    this.MoveArea = MoveArea; 
	this.x;
	this.y; 
    this.obj = obj + "Object";
    eval(this.obj + "=this");
    return this;
} 

function MoveArea(x,y){ 
    this.x = x;
	this.y = y;
    this.css.left = this.x; 
    this.css.top = this.y;
} 
 
function MoveAreaDown(move){ 
	if (this.y > -this.scrollHeight + objContainer.clipHeight) { 
    	this.MoveArea(0, this.y - move);
    if (loop) setTimeout(this.obj + ".down(" + move + ")", speed);
	} 
} 

function MoveAreaUp(move){ 
	if (this.y < 0) { 
    	this.MoveArea(0, this.y - move);
    	if (loop) setTimeout(this.obj + ".up(" + move + ")", speed);
	} 
} 
 
function PerformScroll(speed) { 
	if (initialised) { 
		loop=true; 
		if(speed > 0) objScroller.down(speed);
		else objScroller.up(speed);
	} 
} 
 
function CeaseScroll() { 
    loop = false;
    if(timer) clearTimeout(timer);
} 

var imagesCount;
var leftImage;
var rightImage;
var imageCells;

function ScrollImages(direction)
{
	if(direction < 0)
	{		
		if(leftImage > 0)
		{
			leftImage -= 1;
			imageCells[rightImage].style.display = "none";
			imageCells[leftImage].style.display = "";
			rightImage -= 1;
		}
	}
	else if(direction > 0)
	{
		if(rightImage < (imagesCount - 1))
		{
			rightImage += 1;
			imageCells[leftImage].style.display = "none";
			imageCells[rightImage].style.display = "";
			leftImage += 1;
		}
	}
}

var initialised; 

function InitialiseScrollableArea() { 	
    objContainer = new ConstructObject('divContainer');
    objScroller = new ConstructObject('divContent', 'divContainer');
    objScroller.MoveArea(0, 0);
    objContainer.css.visibility = 'visible';
    initialised = true; 
} 

function InitializeImages(selectedImage)
{
	var imageTable = bw.dom ? document.getElementById("images"): bw.ie4?document.all["images"] : bw.ns4?eval('document.images') : 0;
	
	if(imageTable != 0 && imageTable != null)
	{
		imageCells = imageTable.rows[0].cells;
		leftImage = 0;
		imagesCount = imageCells.length;
		rightImage = (imagesCount < 4) ? (imagesCount - 1) : 3;
		var lowerBound = 0;
		var upperBound = selectedImage;
		
		if(selectedImage < 3)
		{
			upperBound = rightImage;
		}
		else
		{
			lowerBound = selectedImage - 3;			
			leftImage = lowerBound;
			rightImage = upperBound;
		}
		
		for(var i = 0; i < imagesCount; i++)
		{
			if(i >= lowerBound && i <= upperBound)
				imageCells[i].style.display = "";
			else
				imageCells[i].style.display = "none";
		}
	}
}