function large_foto(file,popup_width,popup_height)
	{
		
		// set the screen position where the popup should appear
		
		var vertical = (screen.width/2)-(popup_width/2);
		var horizontal = (screen.height/2)-(popup_height/2);
		
	    popup = window.open(file,"","toolbar=no, left="+vertical+", top="+horizontal+", location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=yes, copyhistory=yes, width="+popup_width+", height="+popup_height);
	}