var is_IE4 = false;

if(navigator.appName == "Microsoft Internet Explorer")
	if(parseInt(navigator.appVersion) >= 4)
		is_IE4 = true;

function PicOn(obj)
{
	if(is_IE4)
		obj.background = "../images/button_over.gif";
}

function PicOff(obj)
{
	if(is_IE4)
		obj.background = "../images/button_off.gif";
}

function OpenGuestBook()
{
	window.open("http://www.guestbook.de/yasg.cgi?X=225597", "BIU_GuestBook", "width=650,height=550,scrollbars=1").focus();
}