var g_nStartIdx = 0;
var g_aoThumbs = null;
var g_nCurThumbIdx = 0; // Index within the thumb array
function GetThumbs()
{
if(g_aoThumbs == null)
{	// Build the array
g_aoThumbs = new Array();
var oAnchor = GetFirstChild(g_divThumbs);
while(oAnchor != null)
{
var oThumb = GetFirstChild(oAnchor);
if(oThumb != null)
{
g_aoThumbs.push(oThumb);
}
oAnchor = GetNextSibling(oAnchor);
}
}
return g_aoThumbs;
}
function GetIdxByThumb(oCurThumb)
{
var nCurIdx = 0;
var aoThumbs = GetThumbs();
for(var nIdx = 0; nIdx < aoThumbs.length; nIdx++)
{
var oThumb = aoThumbs[nIdx];
if(oThumb.id == oCurThumb.id)
{
nCurIdx = nIdx;
break;
}
}
return nCurIdx;
}
function GetThumbByIdx(nIdx)
{
var oThumb = null;
var aoThumbs = GetThumbs();
if(nIdx < aoThumbs.length)
{
oThumb = aoThumbs[nIdx];
}
return oThumb;
}
function ChooseImage(strThumbId)
{
var oThumb = Xtt.Get(strThumbId);
ChooseImageByThumb(oThumb);
}
function ChooseImageByThumb(oThumb)
{
var nIdx = GetIdxByThumb(oThumb);
ChooseImageByIdx(nIdx);
}
function ChooseImageByIdx(nNewThumbIdx)
{
var oPicItem = g_aoPicGalItems[g_nStartIdx+nNewThumbIdx];
g_wimgImage.src = oPicItem.Url;
g_divCation.innerHTML = oPicItem.Caption;
g_nCurThumbIdx = nNewThumbIdx;
if(g_nStartIdx == 0)
{	// We are at the beginning.
g_wlinkGoLeft.className = "NoMorePicture";
}
else
{	// We still can go left.
g_wlinkGoLeft.className = "";
}
if(g_nStartIdx+4 >= g_aoPicGalItems.length)
{	// The last picture of the gallery is visible
g_wlinkGoRight.className = "NoMorePicture";
}
else
{	// We still can go right.
g_wlinkGoRight.className = "";
}
}
function MoveToLeftPic()
{
if(g_nCurThumbIdx > 0)
{
ChooseImageByIdx(g_nCurThumbIdx-1);
}
else
{
SetImages(g_nStartIdx-1);
}
}
function MoveToRightPic()
{
if(g_nCurThumbIdx < 3)
{
var aoThumbs = GetThumbs();
if(g_nCurThumbIdx < aoThumbs.length-1)
{
ChooseImageByIdx(g_nCurThumbIdx+1);
}
}
else
{
SetImages(g_nStartIdx+1);
}
}
function SetImages(nStartIdx)
{
if(nStartIdx >= 0 && nStartIdx <= g_aoPicGalItems.length-4)
{
var aoThumbs = GetThumbs();
var nUpperBound = Math.min(g_aoPicGalItems.length, nStartIdx+4)-1;
var nAnchorIdx = 0;
for(var nIdx = nStartIdx; nIdx <= nUpperBound && nAnchorIdx < aoThumbs.length; nIdx++)
{
var oItem = g_aoPicGalItems[nIdx];
var oThumb = aoThumbs[nAnchorIdx];
oThumb.src = oItem.ThumbUrl;
oThumb.alt = oItem.Caption;
nAnchorIdx++;
}
g_nStartIdx = nStartIdx;
ChooseImageByIdx(g_nCurThumbIdx);
}
}