var xmlhttp;

$(document).ready(function () {
	tampilkanGambar();
	gantiGambar();
});

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

function gantiGambar()
{
setInterval('panggilfungsi()',4000);
}

function panggilfungsi()
{
	var vsid=Math.random();
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null)
	{
		alert ("Your browser does not support XMLHTTP!");
		return;
	}
	var url="responseGDepan.php";
	url=url+"?sid="+vsid;
	xmlhttp.onreadystatechange=stateChanged;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}

function stateChanged()
{
	if (xmlhttp.readyState==4)
	{
		result=xmlhttp.responseXML.documentElement;
		var jumlah=result.getElementsByTagName("id").length
		if(jumlah!=0)
		{
			var gambar=result.getElementsByTagName("gambar")[0].childNodes[0].nodeValue;
			blendimage('blenddiv','blendimage',gambar,200);
		}
	}
}


function tampilkanGambar()
{
	var vsid=Math.random();
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null)
	{
		alert ("Your browser does not support XMLHTTP!");
		return;
	}
	var url="responseGDepan.php";
	url=url+"?sid="+vsid;
	xmlhttp.onreadystatechange=stateChanged2;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}


function stateChanged2()
{
	var hasil="";
	if (xmlhttp.readyState==4)
	{
		var result=xmlhttp.responseXML.documentElement;
		var jumlah=result.getElementsByTagName("id").length;
		if(jumlah!=0)
		{
			var nama=result.getElementsByTagName("nama")[0].childNodes[0].nodeValue;
			var gambar=result.getElementsByTagName("gambar")[0].childNodes[0].nodeValue;
			hasil=hasil+"<div style=\"text-align:center;background: url("+gambar+") no-repeat center; height: 235px;\" valign=\"bottom\" id=\"blenddiv\">";
			hasil=hasil+"<img src=\""+gambar+"\" style=\" height: 235px; border: 0 none; filter: alpha(opacity=0); -moz-opacity: 0; opacity: 0;\" id=\"blendimage\" alt=\""+nama+"\" /></div>";
			document.getElementById("slideshow").innerHTML=hasil;
		}
		else
		{
			document.getElementById("slideshow").innerHTML="";
		}
	}
}


function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 10);
	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 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 + ")";
}