function showObject(id){
	
	object = document.getElementById(id);	
	
	if(object){
		object.className = 'visible';	
	}	
	
}

function hideObject(id){
	
	object = document.getElementById(id);	
	
	if(object){
		object.className = 'hidden';	
	}	
	
}

function selectPreview(id){
	
	object = document.getElementById(id);	
	
	if(object){
		object.className = 'selected';	
	}	
	
}

function deselectPreview(id){
	
	object = document.getElementById(id);	
	
	if(object){
		object.className = 'preview';	
	}	
	
}