function openWindow(url, n, w, h, features)
{
	if (screen.width)
	{
		var winl = (screen.width-w)/2;
		var wint = (screen.height-h)/2;
	}
	else
	{
		winl = 0; wint = 0;
	}
	
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	
	var settings	= 'height=' + h + ',';
	settings		+= 'width=' + w + ',';
	settings		+= 'top=' + wint + ',';
	settings		+= 'left=' + winl + ',';
	settings		+= features;
	
	win = window.open(url, n, settings);
	win.window.focus();
}