var allowedImagesCount = 4;
var firstImage = 0;
var lastImage = allowedImagesCount-1;
var imagesCount = 0;
var images;

//--------------------------------------------------------
var left = '<a href="javascript:cellOperation(+1);" onMouseOut="swapImgRestore()" onMouseOver=' + "'" + 'swapImage("left","","pic/left_highlight.png",1)' + "'" + '><img src="pic/left.png" name="left" width="22" height="26" border="0"></a>';
var right = '<a href="javascript:cellOperation(-1);" onMouseOut="swapImgRestore()" onMouseOver=' + "'" + 'swapImage("right","","pic/right_highlight.png",1)' + "'" + '><img src="pic/right.png" name="right" width="22" height="26" border="0"></a>';
var leftInactive = '<img src="pic/left_grey.png" name="left" width="22" height="26" border="0">';
var rightInactive = '<img src="pic/right_grey.png" name="right" width="22" height="26" border="0">';

//--------------------------------------------------------
function cellOperation(direction)
{
	if(imagesCount <= allowedImagesCount)
	{
		return;
	}
	
	if(direction == -1)
	{	
		if(lastImage == (imagesCount-1))
		{
			return;
		}	
		for(counter = 0; counter < allowedImagesCount-1; counter++)
		{
			current = document.getElementById('td' + counter);
			next = document.getElementById('td' + (counter + 1));
			
			current.innerHTML = next.innerHTML;
			
		}
		
		lastImage++;
		firstImage++;
		current = document.getElementById('td' + (allowedImagesCount-1));
		picTitle = images[lastImage].Title;
		picPath = images[lastImage].PicturePath ;
		gallPath = images[lastImage].GalleryPath;
		
		current.innerHTML = CurrentInnerHtml(picTitle, picPath, gallPath);	
	}
	else if(direction == +1)
	{
	 
		if(firstImage== 0)
		{
			return;
		}	
		
		for(counter = allowedImagesCount-1; counter > 0; counter--)
		{
			current = document.getElementById('td' + counter);
			prev = document.getElementById('td' + (counter - 1));
			
			current.innerHTML = prev.innerHTML;
			
		}
		
		lastImage--;
		firstImage--;
		current = document.getElementById('td0');
		picTitle = images[firstImage].Title;
		picPath = images[firstImage].PicturePath ;
		gallPath = images[firstImage].GalleryPath;

		current.innerHTML = CurrentInnerHtml(picTitle, picPath, gallPath);		
	}
	
	CheckGalleryButtons();
}

function CurrentInnerHtml(picTitle, picPath, gallPath)
{
      return '<div align="center" ><font size="-2" face="Arial, Helvetica, sans-serif"><a href="' + gallPath + '" target="_blank" alt="' + picTitle + '"><img src="' + picPath + '"  border="0" ></a><br /> ' + picTitle + '</font></div>';
}

function CheckGalleryButtons()
{
	var tdLeft = document.getElementById('galleryLeft');
	var tdRight = document.getElementById('galleryRight');
	
	
	if(firstImage == 0 || imagesCount <= allowedImagesCount )
	{
		tdLeft.innerHTML = leftInactive;
	}
	else
	{
		tdLeft.innerHTML = left;
	}

	if(lastImage == imagesCount -1 || imagesCount <= allowedImagesCount)
	{
		tdRight.innerHTML = rightInactive;
	}
	else
	{
		tdRight.innerHTML = right;
	}
}

function ProcessResponce()
{


eval("images =" + items );
imagesCount = images.length;
CreateTable();

}

function CreateTable()
{
	var tr = document.getElementById('gallery');
	var limit = imagesCount <= allowedImagesCount ? imagesCount : allowedImagesCount;
	for(counter = 0; counter  < limit; counter++)
	{
		newCell = document.createElement("TD");
		newCell .width='170px';
		newCell.id = "td" + counter;
		newCell.className = "gborder" ;
		picTitle = images[counter].Title;
		picPath = images[counter].PicturePath ;
		gallPath = images[counter].GalleryPath;
		newCell.innerHTML =CurrentInnerHtml(picTitle, picPath, gallPath);
		tr.appendChild(newCell);
	}
	
	CheckGalleryButtons();
}


//---------------------------------------------------------------------------------------------------------------

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

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

function 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=findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

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