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 = '<span id="countdown"></span>';
         
         document.write(html_code);
         
         countdown(year, month, day, hour, minute, format);                
         }
        
function pad(num) {
  var s = '000' + num;
  return s.substring(s.length-2);
} 

function countdown(year, month, day, hour, minute, format)
         {
         Today = new Date();
         Offset = Today.getTimezoneOffset() * 60 - 18000;
         Todays_Year = Today.getFullYear();
         Todays_Month = Today.getMonth();                  
         
         //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 - 1, day, hour, minute, 00)).getTime();                  
         
         //Find their difference, and convert that into seconds.                  
         Time_Left = Math.round((Target_Date - Todays_Date) / 1000) + Offset;
         
         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.
                    weeks = Math.floor(Time_Left / (60 * 60 * 24 * 7));
                    Time_Left %= (60 * 60 * 24 * 7);
                    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;
                    
                    wps = 's'; dps = 's'; hps = 's'; mps = 's'; sps = 's';
                    //ps is short for plural suffix.

                    shour = pad(hours);
                    sminutes = pad(minutes);
                    sseconds = pad(seconds);
                   
                    document.all.countdown.innerHTML = shour + ' hours ' + sminutes + ' minutes ' + sseconds + ' seconds'; 
                    break;
               default: 
                    document.all.countdown.innerHTML = Time_Left + ' seconds';
               }
               
         //Recursive call, keeps the clock ticking.
         setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + format + ');', 1000);
         }