function na_preload_img()
{ 
	var img_list = na_preload_img.arguments;
	if (document.preloadlist == null) 
		document.preloadlist = new Array();
	var top = document.preloadlist.length;
	for (var i=0; i < img_list.length-1; i++) 
	{
		document.preloadlist[top+i] = new Image;
		document.preloadlist[top+i].src = img_list[i+1];
	} 
}

function na_change_img_src(name, nsdoc, rpath, preload)
{ 
	var img = eval((navigator.appName.indexOf('Netscape', 0) != -1) ? nsdoc+'.'+name : 'document.all.'+name);
	if (name == '')
		return;
	if (img) 
	{
		img.altsrc = img.src;
		img.src    = rpath;
	} 
}

function na_restore_img_src(name, nsdoc)
{
	var img = eval((navigator.appName.indexOf('Netscape', 0) != -1) ? nsdoc+'.'+name : 'document.all.'+name);
	if (name == '')
		return;
	if (img && img.altsrc) 
	{
		img.src    = img.altsrc;
		img.altsrc = null;
	} 
}