function show(baliseId) {
	if (document.getElementById && document.getElementById(baliseId) != null) {
		document.getElementById(baliseId).style.visibility='visible';
		document.getElementById(baliseId).style.display='block';
	}
}

function hide(baliseId) {
	if (document.getElementById && document.getElementById(baliseId) != null) {
		document.getElementById(baliseId).style.visibility='hidden';
		document.getElementById(baliseId).style.display='none';
	}
}

function showHide(baliseId) {
	if ( (document.getElementById(baliseId).style.visibility=='visible') || (document.getElementById(baliseId).style.display=='block') ) {
		hide(baliseId);
	}
	else {
		show(baliseId);
	}
}

function switchTreeDiv(baliseId, imgId, imgHiddenSrc, imgExpandedSrc) {
	if ( (document.getElementById(baliseId).style.visibility=='visible') || (document.getElementById(baliseId).style.display=='block') ) {
		hide(baliseId);
		document.getElementById(imgId).src = imgHiddenSrc;
	}
	else {
		show(baliseId);
		document.getElementById(imgId).src = imgExpandedSrc;
	}
}

function showChannels() {
	show('channels');
	//hide('player');
}

function hideChannels() {
	hide('channels');
	//show('player');
}