function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 100;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 100;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}
var slideCache = new Array(); 
var maxAds = 4;
var currentAd = 1;
var theImageFile = "images/banners/mockAd2.gif";

function RunSlideShow(divid,imageid,imageFiles,displaySecs) 
{ 
	var nextImage = imageFiles;
	getImage()
	changeOpac(0, imageid); 
	blendimage(divid,imageid,nextImage,1200); 
	currentAd++;
	if (currentAd > maxAds) {
		currentAd = 1;
	}
	
	var futureImages = theImageFile
	eval("document.Ad" + currentAd + ".theImage.value=futureImages;")
	
	setTimeout("RunSlideShow('theAd"+currentAd+"','theImage"+currentAd+"','"+futureImages+"',"+displaySecs+")",displaySecs*500);
	
	// Cache the next image to improve performance. 
	if (slideCache[currentAd] == null) { 
		slideCache[currentAd] = new Image; 
		slideCache[currentAd].src = futureImages; 
	} 
}

var xmlHttp;
	
	
	function getImage()
	{
		
		xmlHttp=GetXmlHttpObject()
		if (xmlHttp==null) {
			alert ("Your browser does not support AJAX!");
			return;
		} 
		var url="ajax_GetAds.asp";
		
		url=url+"?sid="+Math.random();
		
		xmlHttp.onreadystatechange=stateChanged;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
	} 
	
	function stateChanged() 
	{ 
		var tempValue;
		var tempObject;
		if (xmlHttp.readyState==4) { 
			var optionsArray = new Array();
			var tempStr = xmlHttp.responseText;
			theImageFile = tempStr;
		}
	}
	
	
	
	function GetXmlHttpObject()
	{
		var xmlHttp=null;
		try {
	  	// Firefox, Opera 8.0+, Safari
	  	xmlHttp=new XMLHttpRequest();
	  	} catch (e) {
		  	// Internet Explorer
		  	try {
		    	xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		    } catch (e) {
		    	xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		    }
	  	}
		return xmlHttp;
	}