//---------------------------------------------------------
// JAVA ZAUBEREI LAYOUT III
//---------------------------------------------------------

var sUploadUrl = "../asp_service/upload/content/";

var nImageCount = 0;
var sCurrentImage = "";
var nCurrentImageID = 0;

function changeImage(sArg) {

	document.getElementById('zoom_img').src = sUploadUrl+sArg;

}

function nextImage() {

	readGalleryData();
	var sNextImage = (nCurrentImageID < (nImageCount-1)) ? String(document.getElementById('img_'+(nCurrentImageID+1)).value) : String(document.getElementById('img_0').value);
	changeImage(sNextImage);

}

function prevImage() {

	readGalleryData();
	var sPrevImage = (nCurrentImageID > 0) ? String(document.getElementById('img_'+(nCurrentImageID-1)).value) : String(document.getElementById('img_'+(nImageCount-1)).value);
	changeImage(sPrevImage);

}

function readGalleryData() {

	nImageCount = Number(document.getElementById('galleryCount').value);
	sCurrentImage = getImageFromUrl(String(document.getElementById('zoom_img').src));
	nCurrentImageID = 0;
	
	for (i=0; i<nImageCount; i++) {
		
		if (String(document.getElementById('img_'+i).value) == sCurrentImage) {
			
			nCurrentImageID = i;
			break;
			
		}
		
	}

}

function getImageFromUrl(sArg) {

	var sFile = sArg.substr(sArg.lastIndexOf("/")+1);
	return sFile;

}