function ImageNavigate(entry_id, count) {

	this.entry_id = entry_id;
	this.count = count-1;
	this.index = 0;
	
	this.getNextImage = function(direction) {
		var image_id = this.getImageId();
		
		var elem = document.getElementById(image_id);
		if (!elem) {
			return;
		}
		elem.style.display = 'none';
		
		this.index += direction;
		if (this.index > this.count) {
			this.index = 0;
		} else if (this.index < 0) {
			this.index = this.count;
		}
		
		image_id = this.getImageId();
		var elem = document.getElementById(image_id);
		if (!elem) {
			return;
		}
		elem.style.display = 'block';
	}

	this.getImageId = function() {
		return 'image_' + this.entry_id + '_' + this.index; 
	}
	
	this.popupImage = function(url) {
		window.open(url, 'image');
	}
	
}