function _showhide ( id ) {
	
	el = document.getElementById(id)
		
	if (! el ) {
		return;
	}
	
	if( el.style.display == 'none' ) {
		el.style.display = 'block';	
	} else {
		el.style.display = 'none';	
	}
	
	return false; //don't jump on hrefs...
}

function show( id ) {
	el = document.getElementById(id)
	
	if (! el ) {
		return;
	}
	
	el.style.display = 'block';
}

function hide( id ) {
	el = document.getElementById(id)
	
	if (! el ) {
		return;
	}
	
	el.style.display = 'none';
}

function redraw_arrows( id ) {
	el = document.getElementById(id);
	
	if (! el ) {
		return;
	}
	
	
	if ( el.innerHTML == '<<' ) {
		el.innerHTML = '>>';
	} else {
		el.innerHTML = '<<';
	}

}