function show_content(content){
	$('cup_content_link_0').className = '';
	$('cup_content_link_1').className = '';
	$('cup_content_link_2').className = '';
	$('cup_content_link_3').className = '';
	
	$('cup_content_link_'+content).className = 'active';
	
	display('cup_content_0', 'hide');
	display('cup_content_1', 'hide');
	display('cup_content_2', 'hide');
	display('cup_content_3', 'hide');
	
	display('cup_content_'+content, 'show');
}

function display(elm, action){
	switch (action){
		case 'toggle':
			if ($(elm).getStyle('visibility') != 'hidden'){
				display(elm, 'hide');
			}
			else{
				display(elm, 'show');
			}
		break;
		case 'show':
			$(elm).setStyle('visibility', 'visible');
			$(elm).setStyle('display', 'block');
		break;
		case 'hide':
			$(elm).setStyle('visibility', 'hidden');
			$(elm).setStyle('display', 'none');
		break;
		default:
			display(elm, 'show');
		break;
	}
}