// global variables
var adArray = null;
var imageArray = null;
var currentAd = 0;
var mainAd = null;
var counter = 0;
var adDuration=3000;
var currentTimeOutID = 0;

function parseLinkImage(adLinkArray, adImagePathArray, adCaptionArray, adIndex)
{
	if (adLinkArray[adIndex] != null)
		document.writeln("<div><a href=\"" + adLinkArray[adIndex] + "\"><img src=\"" + adImagePathArray[adIndex] + "\" alt=\"" + adCaptionArray[adIndex] + "\" border=0 width=133 height=170 ID=\"image" + adIndex + "\"></a></div>");
	else
		document.writeln("<div><img src=\"" + adImagePathArray[adIndex] + "\" ID=\"image" + adIndex + "\"></div>");
}

function parseNav(adImagePathArray2)
{
	document.write("<div align=\"right\"><font size=1 face=arial style=\"color: #b1b4b5\">");
	var selectedIndex = 0;
	for (j = 0; j < adImagePathArray2.length; j++)
	{
		selectedIndex = j + 1;
		//document.write("<a style=\"color: #b1b4b5\" href=\"javascript:;\" onclick=\"runEffect('" + selectedIndex + "');\">" + selectedIndex + "</a> | ");
	}
	document.writeln("</font><a href=\"javascript:;\" onclick=\"runEffect('prev');\"><img src=\"\/images\/home\/main\/arrow_prev_gray.gif\" width=\"8\" height=\"9\" border=\"0\" align=\"absbottom\"></a><img src=\"\/images\/spacer.gif\" width=\"6\" height=\"1\"><a href=\"javascript:;\" onclick=\"runEffect('next');\"><img src=\"\/images\/home\/main\/arrow_next_gray.gif\" width=\"8\" height=\"9\" border=\"0\" align=\"absbottom\"></a></div>");
}

function runEffect(whichAd)
{
	if (counter++ == 0)
	{
		// next loop after a preset period
		currentTimeOutID = setTimeout("runEffect()", adDuration);
		return;
	}

//	if (isLAN())
//	{
		// define filter style
		mainAd.style.filter = "blendTrans(duration=1) revealTrans(duration=1,transition=5)";
		
		// freeze current state
		mainAd.filters(0).apply();
		mainAd.filters(1).apply();
//	}

	// turn off current one
	adArray[currentAd].display = "none";
	
	// find out the next one
	if (!isNaN(parseInt(whichAd)))
	{
		currentAd = parseInt(whichAd) - 1;
	}	
	else if (whichAd == "prev")
	{
		var previousAd = currentAd - 1;
		if (previousAd <= -1)
			previousAd = imageArray.length - 1;
		currentAd = previousAd;
	}
	else
	{
		var nextAd = (currentAd + 1) % imageArray.length;
		currentAd = nextAd;
	}
	
	// turn the next one visible
	adArray[currentAd].display = "block";

//	if (isLAN())
//	{
	// execute filter
//		mainAd.style.filter = "revealTrans(duration=6,transition=23)";	
		mainAd.filters(0).play();
		mainAd.filters(1).play();
//	}

	// clear previously set time out if previous and next buttons is clicked
	if ((!isNaN(parseInt(whichAd))) || whichAd == "prev" || whichAd == "next")
		clearTimeout(currentTimeOutID);
		
	// next loop after a preset period
	currentTimeOutID = setTimeout("runEffect()", adDuration);
}

function filterEffect(adLinkArray, adImagePathArray, adCaptionArray, adWidth, adHeight, showNav)
{
	// generate random number
	// var randomChoice = Math.floor(Math.random() * adLinkArray.length);
	var randomChoice = 0;
	
	// show effect and list only for IE5(PC) & Firefox
	if ( (isIE5plus() || isFirefox() || isNetscape6or7()) && (adImagePathArray.length > 1) )
	{
		currentAd = randomChoice;
	
		document.writeln("<div id=\"mainAd\" style=\"width:" + adWidth + "px;height:" + adHeight + "px\">");
	
		for (i = 0; i < adImagePathArray.length; i++)
		{
			document.write("<div id=\"ad" + i + "\" style=\"display:");
	
			if (i == randomChoice)
				document.writeln("block\">");
			else
				document.writeln("none\">");
	
			parseLinkImage(adLinkArray, adImagePathArray, adCaptionArray, i);
			
			if (showNav != null)
				parseNav(adImagePathArray);
	
			document.writeln("</div>");
		}
	
		document.writeln("</div>");
	
		adArray = new Array(adImagePathArray.length);
		imageArray = new Array(adImagePathArray.length);
	
		for (i = 0; i < adImagePathArray.length; i++)
		{
			adArray[i]	= document.getElementById("ad" + i).style;
			imageArray[i]	= document.getElementById("image" + i);
		}
	
		mainAd = document.getElementById("mainAd");
		
		runEffect();
	}
		else
	{
		parseLinkImage(adLinkArray, adImagePathArray, adCaptionArray, randomChoice);
		return;
	}
	
}

function isLAN()
{
	try
	{
		document.body.addBehavior ("#default#clientCaps");
		var isLAN = (typeof(document.body.connectionType) != "undefined" && document.body.connectionType == "lan") ? true : false;
		return isLAN
	}
	catch(e)
	{
		return false;
	}
}

function isIE5plus()
{
	var browser = navigator.userAgent;
	var startPos = browser.indexOf("MSIE");
	if (startPos < 0)
		return false;

	var IEversion = parseInt(browser.substring(startPos+5, browser.indexOf(".", startPos)));
	
	if (IEversion < 5)
		return false;
	else
		return true;
}

function isFirefox()
{
	var browser = navigator.userAgent;
	var startPos = browser.indexOf("Firefox");
	if (startPos < 0)
		return false;
	else
		return true;
}

function isNetscape6or7()
{
	var browser = navigator.userAgent;
	var startPosNS6 = browser.indexOf("Netscape6");
	var startPosNS7 = browser.indexOf("Netscape/7");
	
	if ((startPosNS6 >= 0) || (startPosNS7 >= 0))
		return true;
	else
		return false;
}