function displayTimePicker(timeFieldName)
{
  var targetTimeField = document.getElementsByName(timeFieldName).item(0);
  var x = targetTimeField.offsetLeft;
  var y = targetTimeField.offsetTop + targetTimeField.offsetHeight;

  var parent = targetTimeField;
  while (parent.offsetParent) 
  {
    parent = parent.offsetParent;
    x += parent.offsetLeft;
    y += parent.offsetTop ;
  }
  
  drawTimePicker(targetTimeField, x, y);
}