function foto(url){  
     var window_width = '400';  
     var window_height = '950';  
     var window_top = (screen.height-window_height)/2-150;  
     var window_left = (screen.width-window_width)/2-5;  
     newWindow=window.open(url,'foto','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,maximize=no,minimize=no');  
     newWindow.focus(); 
} 
function foto_los(url){  
     var window_width = '400';  
     var window_height = '950';  
     var window_top = (screen.height-window_height)/2-150;  
     var window_left = (screen.width-window_width)/2-5;  
     newWindow=window.open(url,'foto','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,maximize=no,minimize=no');  
     newWindow.focus(); 
}