var pleaseExpandMe = [ 'expand1', 'expand2', 'expand3', 'expand4' ];

function switchVisibility( elemId, visibilitySet ){
	// alert( "need to hide/unhide element with id '"+elemId+"' visibility" );
	
	for( dx in visibilitySet ){
		elemToHideId = visibilitySet[dx];
		elemToHide = document.getElementById(elemToHideId);
		if( elemToHide != null ){
			if( elemId == elemToHideId ){
				if( elemToHide.style.display != 'none' ){
					elemToHide.style.display = 'none';
				}else{
					elemToHide.style.display = 'block';
				}
			}else{
				elemToHide.style.display = 'none';
			}
		}
	} 
}