function showImage(srcStr, titleStr, id) {
	el_gallery_photo = document.getElementById('gallery_photo');
	el_gallery_photo.src = srcStr;
	
	el_gallery_photo = document.getElementById('gallery_photo_title');
	el_gallery_photo.innerHTML = titleStr;
	
	links = getElementsByClass('nav');
	for(i=0; i < links.length; i++) {
		link = links[i];
		linkHref = link.href;
		if(linkHref.lastIndexOf('&fn=') > -1) {
			newlink = linkHref.substr(0, linkHref.lastIndexOf('&fn='));
			newlink += '&fn=' + id;
			
			link.href = newlink;
		} else {
			link.href += '&fn=' + id;
		}
	}
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if (node == null)
		node = document;
	if (tag == null)
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	var j = 0;
	for (i = 0; i < elsLen; i++) {
		if (pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}