var nCurrImage = 1;
var nMaxImages = 0;
var objCurrImage = null;

// ****************************************************************************
// ajaxCall
// ****************************************************************************
function ajaxCall(url, containerid){
  xmlhttp.open('GET', url, true);
  //Check that the PHP script has finished sending us the result
  xmlhttp.onreadystatechange = function() {
    if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
      document.getElementById(containerid).innerHTML=xmlhttp.responseText;
    }
	}
	xmlhttp.send(null);
}

function init(nImages) {
  nMaxImages = nImages;
}

function selectImage(index, filename, width, caption) {
  if (filename != '') {
    nCurrImage = index;
	url = "overlay_image.php?filename="+filename+"&width="+width+"&caption="+caption;
    ajaxCall(url, "overlay_image");
    updateThumb(nCurrImage);
  }
}

function updateImageLeft() {
  if ((nCurrImage-1) > 0) {
    selectImage(nCurrImage-1);    
  }
}

function updateImageRight() {
  selectImage(nCurrImage+1);    
}

function updateThumb(nImage) {  
  overlayImageClick(document.getElementById("image"+nImage));
}

function overlayImageRollover(objThis) {
  objThis.className='overlay-image-link-over';  
}

function overlayImageRollout(objThis) {
  if (objThis != objCurrImage) {
    objThis.className='overlay-image-link';
  }
}

function overlayImageClick(objThis) {
  if (objCurrImage) {
    objCurrImage.className='overlay-image-link';
  }
  objCurrImage = objThis;
  
  objThis.className='overlay-image-link-over';
}

// ****************************************************************************
// Macromedia functions
// ****************************************************************************
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//## Mark's own functions

var selected = 0;
var count = 0;

function setSelected(index) {
	selected = index;
}
function setCount(index) {
	count = index;
}
function moveLeft() {
	if (selected == 0) {
		showHide(count-1);
	} else {
		showHide(selected-1);
	}
}
function moveRight() {
	if (selected+1 < count) {
		showHide(selected+1);
	} else {
		showHide(0);
	}
}
function showHide(index) {
	setSelected(index);
	for (i=0; i<count; i++) {
		if (i == index) {
			document.getElementById("i"+i).style.display = "inline";
		} else {
			document.getElementById("i"+i).style.display = "none";
		}
	}
}