<select id='year'></select>

<script type='text/javascript'>
function init()
{
    var endyear = new Date().getFullYear();
    var startyear = endyear - 2;
    for(var i = startyear ; i <= endyear ; i ++)
    {
        var opt = document.createElement('option');
        opt.innerHTML = opt.value = i;
        document.getElementById('year').appendChild(opt);
    }
}
init();
  </script>