var active_nr = -1;
var image_count = 0;


function show(nr)
{
	active_nr = nr;
	document.getElementById('image_layer').innerHTML = document.getElementById('image_layer_' + nr).innerHTML;
	document.getElementById('text_layer').innerHTML = document.getElementById('text_layer_' + nr).innerHTML;
}


function imgrep(id, ext)
{
	if(document.all && ext.indexOf(".png") != -1)
	{
		document.getElementById(id).style.cssText = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=image src='/custom/img/nav/" + id + ext + "');";
	}
	else
	{
		document.getElementById(id).src = "/custom/img/nav/" + id + ext;
	}
}


function prev_click()
{
	if(active_nr > 0) 
		show(active_nr - 1); 

	if(active_nr == 0) 
		imgrep('prev', '_l.gif');
}

function prev_over()
{
	if(active_nr > 0) 
		imgrep('prev', '_h.gif');
}


function next_click()
{
	if(active_nr < image_count - 1) 
		show(active_nr + 1); 

	if(active_nr == image_count - 1)
		imgrep('next', '_l.gif');
}

function next_over()
{
	if(active_nr < image_count - 1) 
		imgrep('next', '_h.gif');
}