function showMenu(id) {
	document.getElementById(id).style.visibility = 'visible';
}

function hideMenu(id) {
	document.getElementById(id).style.visibility = 'hidden';
}

function openwindow(id,width,height) {
  var prefix = "?mod=obrazok";
  var height = height + 30;
  var left = (screen.width-width)/2;
  var top = (screen.height-height)/2;
  window.open(prefix + "--" + id,"okno_1","menubar=no,scrollbars=no,"+"directories=no,location=no,toolbar=no,"+"resizable=yes,width="+width+",height="+height+",top=" +top+",left=" +left);
}

function A_advise_page() {
	window.location="mailto:" + window.prompt(A_ADVISE_PAGE_ENTER_EMAIL) + A_ADVISE_PAGE_TEXT;
	return false;
}
var A_ADVISE_PAGE_TEXT = "?subject=Odporucanie od znameho.&body=Dostali ste odporucanie od svojho znameho na stranku: " + document.location + ".",
	A_ADVISE_PAGE_ENTER_EMAIL = "zadajte email Vašeho známeho";