var myWin

	function foto(width, height)
	{
		if (myWin)
			myWin.close();

		width = width + 40;
		height = height + 120;

		if (width > screen.width)
		{
			width = window.screen.width;
			posX = 0;
		}
		else
			posX = (screen.width - width) / 2;
			
		if (height > window.screen.height)
			height = window.screen.height;			
		
		myWin = window.open('', 'foto', 'toolbar=no, location=no, directories=no, status=no, scrollbars=yes, resizable=no, copyhistory=no, left=' + posX + ', top=0, width=' + width + ', height=' + height);
		myWin.resizeTo(width, height);
	
		myWin.focus();
	}