function hide( idElem )
{
	if (document.getElementById) {
		var Element = document.getElementById(idElem)
		
		if(Element) {
			Element.style.display = "none";
		}
	}
}


function show( idElem ) {
	var Elem = document.getElementById(idElem);
	if ( Elem ) {
		Elem.style.display = "";
	}
}

function toggleVisibility( id )
{
	var el = document.getElementById( id );

	if ( !el ) return;

	if ( el.className == 'hidden' ) {
		el.className = 'visible';
	}
	else {
		el.className = 'hidden';
	}
}