<!--//
	browser_name = navigator.appName;
	browser_version = parseFloat(navigator.appVersion); 
	if (browser_name == "Netscape" && browser_version < 2.0)  {roll = false;}
	else if (browser_name == "Netscape" && browser_version == 2.0)  {roll = false;}
	else if (browser_name == "Netscape" && browser_version >= 3.0)  {roll = true;}
	else if (browser_name == "Microsoft Internet Explorer" && browser_version <= 2.0)  {roll = false;}
	else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0)  {roll = true;}
	else  {roll = false;}

	function Img_New (name, width, height)
		{
		Img_Item[name] = new Img_Item (name, width, height);
		}

	function Img_Item (name, width, height)
		{
		this.on = new Image (width, height);
		this.on.src = name + "_on.gif";
		this.off = new Image (width, height);
		this.off.src = name + "_off.gif";
		}

	function Img_On (img_name)
		{
		if (roll)	{document.images[img_name].src = Img_Item[img_name].on.src;}
		}

	function Img_Off (img_name)
		{
		if (roll)	{document.images[img_name].src = Img_Item[img_name].off.src;}
		}
//-->