This is not going to be amazing, but I had to find / write a script like that for every hackday / barcamp I attended so far. Being lazy, I just wanted to create one I can re-use later on. So here you are:

• 2 minute countdown with start, pause and reset button and a 30 second reminder

You can either use the counter directly, or right-click and save it for local use. The look and feel is all in the CSS, yo u can set some of the preferences in the counter interface and there are several configuration settings you can change:

var cfg = {
  displayID:'display',  // element to show the seconds
  startButtonID:'c',    // start button ID
  pauseButtonID:'p',    // pause button ID
  finalClass:'final',   // class to add when final coutdown is reached
  overClass:'over',     // class to add when the time is over
  initialText:{
    value:'2:00',
    label:'Initial Text'
  },
  seconds:{
    value:2*60,
    label:'Time in Seconds'
  },
  finalCountdown:{
    value:30,
    label:'Time when the warning starts'
  },
  pauseLabel:{
   value:'pause',
   label:'Pause Text' 
  },  
  resumeLabel:{
    value:'resume',
    label:'Resume Text'
  }
};

Some configuration settings have values and labels, this is because of the preferences form being created from this object.

As said, nothing special, but I hope you can use it, I know I will.