function rozwin(obj) {

		if (document.getElementById(obj).style.display == undefined)
		{
			document.getElementById(obj).style.display = 'none';
		};

		if (document.getElementById(obj).style.display == 'none')
		{
			document.getElementById(obj).style.display = 'block';
			document.getElementById(obj+'img').src = 'http://www.chassee.pl/graf/ukryj.png';
		} else {
			document.getElementById(obj).style.display = 'none';
			document.getElementById(obj+'img').src = 'http://www.chassee.pl/graf/czytaj.png';
		}
};