function ukaz(el, linkId, linkOpen, linkClose) {
	var myelement = document.getElementById(el);
	if( !myelement.style.display || myelement.style.display == "none" ) {
		myelement.style.display = "block";
		document.getElementById(linkId).innerHTML = linkClose;	
	} else {
		myelement.style.display = "none";
		document.getElementById(linkId).innerHTML = linkOpen;	
	}
}

function standard_ukaz(el) {
	var myelement = document.getElementById(el);
	if( !myelement.style.display || myelement.style.display == "none" ) {
		myelement.style.display = "block";
	} else {
		myelement.style.display = "none";
	}
}

function popup(url, wid, hei) {
	zleva = (screen.availWidth-wid)/2;
	shora = (screen.availHeight-hei)/2;
	window.open(url,"popup","left="+zleva+",top="+shora+",scrollbars=yes,resizable=no,toolbar=no,menubar=no,status=no,location=0,width="+wid+",height="+hei);	
}