system = navigator.userAgent.toUpperCase();
b = navigator.userAgent.toUpperCase();
browser = navigator.appName.toUpperCase();
ver = navigator.appVersion;

newwin = window;
function openwin(url){
	if (browser.indexOf("NETSCAPE") >=0 && ver.indexOf("5") >= 0 || system.indexOf("WIN") >= 0) {
		if(newwin == window || newwin.closed){
			newwin=window.open(url,"nwin",'toolbar=0,location=0,directories=0,status=1,menubar=1,scrollbars=1,resizable=1,width=567,height=500');
		}else{
			window.newwin.focus();
			newwin.location.replace(url);
		}
	}else {
		if(newwin == window || newwin.closed){
			newwin=window.open(url,"nwin",'toolbar=0,location=0,directories=0,status=1,menubar=1,scrollbars=1,resizable=1,width=500,height=490');
		}else{
			window.newwin.focus();
			newwin.location.replace(url);
		}
	}
}