// JavaScript Document

var start = 0;

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 blendimage(divid, imageid, imagefilebg, imagefilefg, millisec)
{
	var speed = Math.round(millisec / 5);<!--- 10 instead of 5 speeds it up --->
	var timer = 0;
	

	// set bg image opacity as 100
	changeOpac(100, divid);
	// alert('Reset bg opacity');

	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url('http://www.lesterproperties.net/" + imagefilebg + "')";
	// var bgurl = "url('" + document.getElementById(imageid).src + "')";
	// alert('Background image: ' + imagefilebg);
	
	changeOpac(100, imageid);
	// alert('Reset image opacity');
	//make image transparent

	//make new image
	document.getElementById(imageid).src = "http://www.lesterproperties.net/" + imagefilefg;
	// alert('Foreground image: ' + imagefilefg);

	
	//fade in image
	// alert('Start fade image');
	for(i = 99; i >= 0; i--)
	{
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
	// alert('End fade image');
	
}

function GetLastImage(imageFiles)
{
	var tempFiles = imageFiles;
	var imageSeparator = tempFiles.indexOf(";");
	while (imageSeparator > 0)
	{
	  var prevImageSep = imageSeparator;
	  var prevTempFiles = tempFiles;
	  // alert("Next image location: "+imageSeparator);
	  // alert("Temp Files "+tempFiles);
      var tempFiles = tempFiles.substring(imageSeparator+1,tempFiles.length);
	  var imageSeparator = tempFiles.indexOf(";");
	} 
    var tempFiles = prevTempFiles.substring(0,prevTempFiles.length-1);;
	// alert("Done "+tempFiles);
	lastImage = tempFiles;
	return lastImage;
}

function RunSlideShowFirstTime(divid,imageid,imageFiles,displaySecs)
{
	var imageSeparator = imageFiles.indexOf(";");
	if(start == 1)
	{
	  var previousImage = GetLastImage(imageFiles);
	} else {
	  // only do this the very first time the script runs
	  var previousImage = "images/header_bg.jpg";
	}
	
	// alert(previousImage);
	var nextImage = imageFiles.substring(0,imageSeparator);
	blendimage(divid,imageid,nextImage,previousImage,100);
	start = 1;
	
	firstdisplaySecs = displaySecs - 1;
	
	var futureImages= imageFiles.substring(imageSeparator+1,imageFiles.length) + nextImage + ';';
	setTimeout("RunSlideShow('"+divid+"','"+imageid+"','"+futureImages+"','"+displaySecs+"')",firstdisplaySecs*1000);
}

function RunSlideShow(divid,imageid,imageFiles,displaySecs)
{
	var imageSeparator = imageFiles.indexOf(";");
	if(start == 1)
	{
	  var previousImage = GetLastImage(imageFiles);
	} else {
	  // only do this the very first time the script runs
	  var previousImage = "images/header_bg.jpg";
	}
	
	// alert(previousImage);
	var nextImage = imageFiles.substring(0,imageSeparator);
	blendimage(divid,imageid,nextImage,previousImage,100);
	start = 1;
	
	var futureImages= imageFiles.substring(imageSeparator+1,imageFiles.length) + nextImage + ';';
	setTimeout("RunSlideShow('"+divid+"','"+imageid+"','"+futureImages+"','"+displaySecs+"')",displaySecs*1000);
}