function countdown_clock(year, month, day, hour, minute, format)
        {
        //I chose a div as the container for the timer, but
        //it can be an input tag inside a form, or anything
        //who's displayed content can be changed through
        //client-side scripting.
        html_code = '<div id="countdown"></div>';
        
        document.write(html_code);
        
        countdown(year, month, day, hour, minute, format);                
        }
        
function countdown(year, month, day, hour, minute, format)
        {
        Today = new Date();
        Todays_Year = Today.getYear() - 2000;
        Todays_Month = Today.getMonth() + 1;                  
        
        //Convert both today's date and the target date into miliseconds.                           
        Todays_Date = (new Date(Todays_Year, Todays_Month, Today.getDate(), 
                                Today.getHours(), Today.getMinutes(), Today.getSeconds())).getTime();                                 
        Target_Date = (new Date(year, month, day, hour, minute, 00)).getTime();                  
        
        //Find their difference, and convert that into seconds.                  
        Time_Left = Math.round((Target_Date - Todays_Date) / 1000);
        
        if(Time_Left < 0)
           Time_Left = 0;
        
        switch(format)
              {
              case 0:
                   //The simplest way to display the time left.
                   document.all.countdown.innerHTML = Time_Left + ' seconds';
                   break;
              case 1:
                   //More datailed.
                   days = Math.floor(Time_Left / (60 * 60 * 24));
                   Time_Left %= (60 * 60 * 24);
                   hours = Math.floor(Time_Left / (60 * 60));
                   Time_Left %= (60 * 60);
                   minutes = Math.floor(Time_Left / 60);
                   Time_Left %= 60;
                   seconds = Time_Left;
                   
                   dps = 's'; hps = 's'; mps = 's'; sps = 's';
                   //ps is short for plural suffix.
                   if(days == 1) dps ='';
                   if(hours == 1) hps ='';
                   if(minutes == 1) mps ='';
                   if(seconds == 1) sps ='';
                   
                   document.all.countdown.innerHTML = days + ' day' + dps + ' ';
                   document.all.countdown.innerHTML += hours + ' hour' + hps + ' ';
                   document.all.countdown.innerHTML += minutes + ' minute' + mps + ' and ';
                   document.all.countdown.innerHTML += seconds + ' second' + sps;
                   break;
              default: 
                   document.all.countdown.innerHTML = Time_Left + ' seconds';
              }
              
        //Recursive call, keeps the clock ticking.
        setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + format + ');', 1000);
        }