function switchActive(currentObject) {
	currentObject.className = currentObject.id + '_on';
}

function switchInactive(currentObject) {

	currentObject.className = currentObject.id + '_off';

}

function show(elementId) {

	if( document.getElementById(elementId));
		document.getElementById(elementId).style.setAttribute('visibility', 'visible', false);
}

function hide(elementId) {
	if( document.getElementById(elementId));
		document.getElementById(elementId).style.setAttribute('visibility', 'hidden', false);

}