function swap_img(name, url) 
{ 
	str = (navigator.appName == 'Netscape') ? 'document.' : 'document.all.';
	img = eval(str+name);
	if (img)
	{
		if (!img.osrc)
		{
			img.osrc = img.src;
			img.src = url;
		}
		else
		{
			var temp = img.src;
			img.src = img.osrc;
			img.osrc = temp;
		}
	} 
}

function preload_img()
{
	var d=document; 
	var img_list = preload_img.arguments;
	if (!d.preloadlist) d.preloadlist = new Array();
	var top = d.preloadlist.length;
	for (var i=0; i < img_list.length; i++)
	{
		d.preloadlist[top+i] = new Image;
		d.preloadlist[top+i].src = img_list[i];
	} 
}