jQuery.fn.countdown = function(params) {
    var self = this;

    //Properties
    //----------------------------------------------            
    //set the time and day to work with
    self.display = $(this);    
    self.target = new Date(params.date);        
    self.message = params.message?params.message:"<style>div#time{display:none;}</style>";
    self.addZeros = params.addZeros?params.addZeros:true;
            
    //Events
    //----------------------------------------------
    self.onTick = params.onTick?params.onTick:function() { return true; };
    self.onFinish = params.onFinish?params.onFinish:function() { return true; };

    //Methods
    //----------------------------------------------   
    //Updates the text for the countdown timer
    self._tick = function() {

        //get the time difference
        var now = (self.target - new Date());
        
        //make sure success hasn't been reached
        if (now.valueOf() < 0) {

            //clear the interval and run the event
            window.clearInterval(self._interval);
            if (!self.onFinish(self.display)) { return; }
            
            //display the finish message
            self.display.html(self.message);
            return;
            
        };
        
        //update the values
        var seconds = now.valueOf()/1000;        
        var day = (Math.floor(seconds/86400))%86400;
        var hrs = (Math.floor(seconds/3600))%24;
        var min = (Math.floor(seconds/60))%60;
        var sec = (Math.floor(seconds/1))%60;
                
        //run the event if needed
        if (!self.onTick(self.display,day,hrs,min,sec)) { return; }; 
        
        //check for zeros
        if (self.addZeros) {
            hrs = (hrs+"").length<2?"0"+hrs:hrs;
            min = (min+"").length<2?"0"+min:min;
            sec = (sec+"").length<2?"0"+sec:sec;
        };
        
		self.display.html(
			"<style>span.b0, span.days_"+day+"{display:none}</style>"+
			"<style>div#time{display:block;}</style>"+ 
			"<style>span.hours_"+day+", span.minutes_"+day+"{display:inline;}</style>"+
			"<span class='b"+day+"'>"+day+"</span>"+
			"<span class='hours_0'>"+hrs+":</span>"+
			"<span class='minutes_0'>"+min+"</span>"
            );
        //display the new time

    };
    
    
    //Setup Routine
    //----------------------------------------------
    self._interval = window.setInterval(
        self._tick,
        params.interval?params.interval:1000
        );
        

    //return itself
    return this;

};