function openWindow(url, title, features){
	var feats = features.split(',');
	var h = feats[0].split('=');
	var w = feats[1].split('=');
	var xpos = (screen.width - w[1]) / 2;
	var ypos = (screen.height - h[1]) / 2;
	var features = features + ',screenX=' + xpos + ',left=' + xpos + ',screenY=' + ypos + ',top=' + ypos;
	window.open(url, title, features);
}