function viewLarge(article_id, filename) {
	window.open(
	 '/content/large_image.php?article_id=' + article_id + '&filename=' + filename,
	 'ViewImage',
	 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no');
}

function changeImage(nextimage) {
	// Hide current
	document.getElementById(ig[ig_current]).style.display = 'none';
	
	// Show next, change ig_current
	if ( nextimage ) { // Show next image
		ig_current = ig_current + 1;
	
		if ( ig_current == ig.length ) { // Last image in list
			ig_current = 0;
		}
	} else { // Show previous image
		ig_current = ig_current - 1;
		if ( ig_current < 0 ) { // First image in list
			ig_current = ig.length - 1;
		}
	}
	
	// Show new current
	document.getElementById(ig[ig_current]).style.display = 'block';
}