function popupImg(img, tit, desc){	
	var ruta='popup_foto.htm';
	var w=200
	var h=100
	var x=parseInt(Math.round((screen.availWidth/2)-(w/2)));
	var y=parseInt(Math.round((screen.availHeight/2)-(h/2))); 
	especificaciones = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=yes,width='+w+',height='+h+',left='+x+',top='+y;		
	window.open(ruta+'?tit='+tit+'&desc='+desc+'&img='+img,'wdwPopupImg',especificaciones);
}