var ImgCount = 0;
var StartVal = 0;
var CurrentImage = 0;
var ajaxtimer = 0;
var showdelay = 5000;

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//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 = 0;
	
	//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)
}


/////////////////////////// AJAX ///////////////////////////////////////


function prepareRequest() 
{
	var http_request = false;
	
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			// See note below about this line
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
	  return false;
	}
	return http_request;
}



function readF(fname)
{
	var oRequest = prepareRequest();
	if (oRequest){
	var sURL  = "http://"+self.location.hostname+"/miscimg/"+fname+".txt?get="+Math.random();
	
	oRequest.open("GET",sURL,false);
	oRequest.setRequestHeader("User-Agent",navigator.userAgent);
    oRequest.setRequestHeader('Cache-Control', 'must-revalidate');
	oRequest.send(null)
	if (oRequest.status==200) 
{
return(oRequest.responseText);
} else return '';
	}
}

function readCount()
{
  ImgCount = readF("count");	
}

function getRandomImg()
{
	return (Math.floor(Math.random()*ImgCount)+1)
}

function ajaxInit()
{
//	readCount()
	readCount();
	//alert(Math.random()+'_');
	StartVal = getRandomImg();
	setInterval(loadinfotimer, showdelay);
	loadInfo(true, 0);
}

function getNextImg()
{
   if (CurrentImage == 0) {
     CurrentImage=StartVal;
	 return CurrentImage;
   }
   CurrentImage++;
   if (CurrentImage > ImgCount) CurrentImage = 1;
   return CurrentImage;
}

function loadInfo(justload, ImgNum)
{
	if (ImgNum == 0)
	{
	getNextImg();
	ImgNum=CurrentImage;
	} else
	{
		//CurrentImage=ImgNum;
	}
	web=readF(ImgNum);
	//alert(CurrentImage+' = '+web);
	web2=web.split("@"); 
	document.getElementById('ajax_link').href=web2[0];
	document.getElementById('ajax_info').innerHTML=web2[1];
	if (justload)
	{
	document.getElementById('blendimage').src = 'miscimg/'+ImgNum+'.jpg';
	document.getElementById('blenddiv').style.backgroundImage = "url(" + document.getElementById('blendimage').src + ")";
	}
	else
	blendimage('blenddiv','blendimage','miscimg/'+ImgNum+'.jpg',600);
}

function loadinfotimer()
{
	loadInfo(false, 0);
}