function displaySidebar(displayId, sidebarCount){
	var e;
	for ( var i = 1; i <= sidebarCount; i++){
		e = document.getElementById('sidebar' + i);
		if ( e )	
			e.style.display = 'none';
	}
	e = document.getElementById(displayId);
	if ( e )
		e.style.display = 'block';
}

function randomHeader(){
	var images = ['url(images/top_whorl.jpg)','url(images/top_hamatsamask.jpg)','url(images/top_woman.jpg)'];
	var header = document.getElementById('topimage');
	var number = Math.floor(Math.random()*(images.length))
	header.style.background = images[number]

}