function NewWindow(url, windowName, w, h, scroll) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable';
	win = window.open(url, windowName, winprops);
	if (parseInt(navigator.appVersion) >= 4) { 
		win.window.focus(); 
	}
}