function scrollTop() {
	if (window.pageYOffset != undefined) return window.pageYOffset;
	if (document.documentElement.scrollTop != undefined) return document.documentElement.scrollTop;
	if (document.body.scrollTop != undefined) return document.body.scrollTop;
	return 0;
}

function show(what) {

	//document.getElementById('big_img').src = '../img/loading.gif';
	//document.getElementById('img_desc').innerHTML = 'Wczytywanie...';
	document.getElementById('img_div').style.display='block';
	document.getElementById('img_div').style.top = scrollTop() + 100 + 'px';

	var img = new Image;
	img.onload = document.getElementById('big_img').src = what;
}

function hide() {
	document.getElementById('img_div').style.display='none';
}