function wind_open_foto(archivo,ruta,anch,alto){
	var width = anch;
   	var height = alto;
   	var left = parseInt((screen.availWidth/2) - (width/2));
  	var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + anch+ ",height=" +alto + ",status=0,resizable=0,left=" + left + ",top=" + top + 
        ",screenX=" + left + ",screenY=" + top;
    winnueva = window.open(archivo+"?ruta="+ruta, "winnueva", windowFeatures);
	winnueva.focus();
}