//document.onLoad = getScreenShots();
var screenShots = new Array();
var altText = new Array();
var xmlHttp;
var current = 0;

function getFile(pURL,where) {
     var curDateTime = new Date();
  oxmlhttp = null;
    try
      { oxmlhttp = new XMLHttpRequest();
        oxmlhttp.overrideMimeType("text/xml");
      }
    catch(e)
      { try
          { oxmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
          }
        catch(e)
          { return null;
          }
      }
    if(!oxmlhttp) return null;
    try
      { oxmlhttp.open("GET",pURL,false);
        oxmlhttp.send(null);
      }
    catch(e)
      { return null;
      }
    //return oxmlhttp.responseText;
	 
	mywebpage=oxmlhttp.responseText;
	//where="nav";
	document.getElementById(where).innerHTML=mywebpage; 
}

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;
}

function getScreenShots(k,url)
{
	current = k;
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
//var url=list;//"xml/images.xml";
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{
var xmlDoc=xmlHttp.responseXML.documentElement;
var images = xmlDoc.getElementsByTagName("image");
for(var i = 0; i<images.length; i++){
screenShots[i]= "images/ScreenShots/" +
images[i].childNodes[0].childNodes[0].nodeValue;
altText[i]=
images[i].getAttribute("alt");
}
putCurrentPicture();
/*altText[0]=
xmlDoc.getElementsByTagName("image")[0].childNodes[3].childNodes[1].nodeValue;*/
}
}

function rightButtonListener(){
	current = (current + 1) % screenShots.length;
	putCurrentPicture();
}
function leftButtonListener(){
	if(current == 0){ current=screenShots.length - 1; }
	else{ current--; }
	putCurrentPicture();
}
function putCurrentPicture(){
	document.getElementById("pictureBox").innerHTML = 
		"<img src='" + screenShots[current] + "' width='300' alt='" + altText[current] + "' />";
	document.getElementById("picText").innerHTML = 
		"<span class='caption'><p>" + altText[current] + "</p></span>";}