function twitterInit() {
	var twitterCount = 0;
	var twitterMax = 14;
	
	if ($('twitter-next') != null) {
		$('twitter-next').show();
		Event.observe('twitter-next', 'click', function(){
			if ($('twitter_update_list') != null) {
				twitterCount += 1;
				if (twitterCount > twitterMax-1) {
					twitterCount = twitterMax-1;
				}
				var top = twitterCount * -180;
				$('twitter_update_list').setStyle({top: top+'px'});
				if (twitterCount == 0) {
					$('twitter-back').hide();
				} else {
					$('twitter-back').show();
				}
				if (twitterCount == twitterMax-1) {
					$('twitter-next').hide();
				} else {
					$('twitter-next').show();
				}
				
			}
		});
	}
	if ($('twitter-back') != null) {
		$('twitter-back').hide();
		Event.observe('twitter-back', 'click', function(){
			if ($('twitter_update_list') != null) {
				twitterCount -= 1;
				if (twitterCount <= 0) {
					twitterCount = 0;
				}
				var top = twitterCount * -180;
				$('twitter_update_list').setStyle({top: top+'px'});
				if (twitterCount == 0) {
					$('twitter-back').hide();
				} else {
					$('twitter-back').show();
				}
				if (twitterCount == twitterMax-1) {
					$('twitter-next').hide();
				} else {
					$('twitter-next').show();
				}
			}
		});
	}
}
Event.observe(window, 'load', twitterInit, false);