function showHideDiv(show,hide) {
	document.getElementById(hide).style.display='none';
	document.getElementById(show).style.display='block';
}

function showHideSpan(show,hide) {
	document.getElementById(hide).style.visibility='hidden';
	document.getElementById(show).style.visibility='visible';
}

function showDiv(id) {
	document.getElementById(id).style.display='block';
}

function hideDiv(id) {
	document.getElementById(id).style.display='none';
}

function showPhoto(host,webroot,id,w,h) {
	okno = window.open('http://'+host+''+webroot+'zdjecia/'+id,'','width='+w+',height='+h);
	var x = (screen.width-w)/2;
        var y = (screen.height-h)/2;
        okno.moveTo(x,y);
}