function slideshow_next(){
	index++;
	index = (index >= imgdata.length) ? 0 : index;
	show_image();
}

function slideshow_prev(){
	index--;
	index = (index < 0) ? imgdata.length-1 : index;
	show_image();
}

function show_image(){
	document.getElementById("slideshow_inner").innerHTML = '<img src="' + imgdata[index] + '" alt="Slideshow" />';
	document.getElementById("slideshow_count").innerHTML = '<p style="color:#ffffff;">' + slide_prefix + (index+1) + slide_delimiter + imgdata.length + slide_suffix + '</p>';
}