function Img_Preload(img) 
	{
	  var a=new Image(); a.src=img; return a; 
	}
	browserOk = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) 
	          || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ))); 
	if (browserOk){
	portal_n = Img_Preload('images/default/portal_n.gif')
	portal_h = Img_Preload('images/default/portal_h.gif')
	imprint_n = Img_Preload('images/default/imprint_n.gif')
	imprint_h = Img_Preload('images/default/imprint_h.gif')
	contact_n = Img_Preload('images/default/contact_n.gif')
	contact_h = Img_Preload('images/default/contact_h.gif')
admin_n = Img_Preload('images/default/admin_n.gif')
	admin_h = Img_Preload('images/default/admin_h.gif')

	}
	
	function openwindow(News){
		params="width=550,height=500,left=0, top=0,resizable=0,status=0,scrollbars=1,toolbar=0,location=0,directories=0,menubar=0";
		var newwin = window.open(News, "address", params);
	}

	function openwindow2(News){
		params="width=450,height=350,left=0, top=0,resizable=0,status=0,scrollbars=1,toolbar=0,location=0,directories=0,menubar=0";
		var newwin = window.open(News, "address", params);
	}
	
	function delete_true(URL, Message){
	Check = confirm(Message);
	if(Check == false) history.back();
	if(Check == true) location.replace(URL);
	}