function setBackgroundImage (id, imageURL) {
  if (document.layers)
    document[id].background.src = imageURL == 'none' ? null : imageURL;
  else if (document.all)
    document.all[id].style.backgroundImage = imageURL == 'none' ? 'none' 
: 'url(' + imageURL + ')';
  else if (document.getElementById)
    document.getElementById(id).style.backgroundImage = imageURL == 
'none' ? 'none' : 'url(' + imageURL + ')';
}

function nextProdGalleryImg() {
	//setBackgroundImage('backgroundCell', 'displayImage.php?imageId=998');	
	imgNum++;
	if(imgNum == galleryImgs.length) {
		imgNum = 0;
	}

	setBackgroundImage('backgroundCell', 'displayImage.php?imageId=' + galleryImgs[imgNum]);
}

function nextGalleryImg(currItemId) {
	for(i=0; i<galleryImgs.length; i++) {
		if(galleryImgs[i] == currItemId) {
			if(i >= (galleryImgs.length-1)) {
				itemId = galleryImgs[0];
			}
			else {
				itemId = galleryImgs[i+1];
			}
		}
	}

	window.location = 'index.php?p=Gallery&e=view&itemId=' + itemId;
}

var imgNum = 0;
var galleryImgs = new Array();