function openWin(w,h,nombre,url,parametro) {
	var ancho = w;
	var alto  = h;
	var swidth  = screen.availWidth;
	var sheight = screen.availHeight;
	var mw = Math.ceil(swidth/2) - Math.ceil(ancho/2);
	var mh = Math.ceil(sheight/2) - Math.ceil(alto/2);
	window.open(url + "?" + parametro, nombre, "width=" + ancho + ", height=" + alto + "; left=" + mw + ", screenX=" + mw + ", top=" + mh + ", screenY=" + mh + ", menubar=false, status=false, scrollbars=yes, resizable=yes").focus();
}