$.fn.countdown = function(options)
{

	var defaults = {
		target: 'September 24, 2011',
		parts: ['days', 'hours', 'minutes', 'seconds'],
		separator: ":",
		leadingZero: true,
		height: 180
	}
	
	var ticker_days = ['<ul>'],
		ticker_hours = ['<ul>'],
		ticker_minutes = ['<ul>'],
		ticker_seconds = ['<ul>'],
		zero = '';
		
	var now,
		target,
		remaining,
		milli,
		a_days,
		days,
		a_hours,
		hours,
		minutes,
		a_minutes,
		seconds;
			
	$.extend(defaults, options);
	
	return this.each(function(){
		
		var timer = ['<ul>'];
				
		for (i=0; i < defaults.parts.length; i++){
			timer.push('<li class="part-'+defaults.parts[i]+'"></li>');
			if (i !== (defaults.parts.length - 1)){
				timer.push('<li class="part-separator">'+defaults.separator+'</li>');
			}

		}
		
		timer.push('</li>');
		timer = timer.join('');
		
		$(this).append(timer);
		
		var now = new Date(),
			target = new Date(defaults.target),
			remaining = target.getTime() - now.getTime(),
			milli = 864e5,
			a_days = remaining / milli,
			days = Math.floor(a_days),
			a_hours = (a_days - days) * 24,
			hours = Math.floor(a_hours),
			minutes = Math.floor((a_hours - hours) * 60),
			a_minutes = (a_hours - hours) * 60,
			seconds = Math.floor((a_minutes - minutes) * 60);
		
		for (i=0; i<=days; i++){
			if(defaults.leadingZero){
				if(i < 10){
					zero = 0;
				}else{
					zero = '';
				}
			}
			ticker_days.push('<li>'+zero+i+'</li>');
		} 
		ticker_days.push('</ul>');
		
		for (i=0; i<=24; i++){
			if(defaults.leadingZero){
				if(i < 10){
					zero = 0;
				}else{
					zero = '';
				}
			}
			ticker_hours.push('<li>'+zero+i+'</li>');
		} 
		ticker_hours.push('</ul>');
		
		for (i=0; i<=59; i++){
			if(defaults.leadingZero){
				if(i < 10){
					zero = 0;
				}else{
					zero = '';
				}
			}
			ticker_minutes.push('<li>'+zero+i+'</li>');
		} 
		ticker_minutes.push('</ul>');
		
		for (i=0; i<=59; i++){
			if(defaults.leadingZero){
				if(i < 10){
					zero = 0;
				}else{
					zero = '';
				}
			}
			ticker_seconds.push('<li>'+zero+i+'</li>');
		} 
		ticker_seconds.push('</ul>');
		
		ticker_days = ticker_days.join('');
		ticker_hours = ticker_hours.join('');
		ticker_minutes = ticker_minutes.join('');
		ticker_seconds = ticker_seconds.join('');
		
		$(this).find('ul li.part-days').append(ticker_days);
		$(this).find('ul li.part-hours').append(ticker_hours);
		$(this).find('ul li.part-minutes').append(ticker_minutes);
		$(this).find('ul li.part-seconds').append(ticker_seconds);
		
		var minutes_height = $('.part-minutes ul').innerHeight(),
			days_height = $('.part-days ul').innerHeight(),
			hours_height = $('.part-hours ul').innerHeight(),
			seconds_height = $('.part-seconds ul').innerHeight();
			
		
		$('.part-seconds ul').css({'top': (defaults.height * seconds) * -1});				
		$('.part-minutes ul').css({'top': (defaults.height * minutes) * -1});
		$('.part-hours ul').css({'top': (defaults.height * hours) * -1});
		$('.part-days ul').css({'top': (defaults.height * days) * -1});
		
		
		timer = window.setInterval(function(){
		
			var now = new Date(),
				target = new Date(defaults.target),
				remaining = target.getTime() - now.getTime(),
				milli = 864e5,
				a_days = remaining / milli,
				days = Math.floor(a_days),
				a_hours = (a_days - days) * 24,
				hours = Math.floor(a_hours),
				minutes = Math.floor((a_hours - hours) * 60),
				a_minutes = (a_hours - hours) * 60,
				seconds = Math.floor((a_minutes - minutes) * 60);
				
			$('.part-seconds ul').animate({'top': ((defaults.height * seconds) * -1)}, 700);				
			$('.part-minutes ul').animate({'top': ((defaults.height * minutes) * -1)}, 700);
			$('.part-hours ul').animate({'top': ((defaults.height * hours) * -1)}, 700);
			$('.part-days ul').animate({'top': ((defaults.height * days) * -1)}, 700);		
		
		}, 1000);
		
	});
	
}