function activeLink(link) {
	switch(link) {
		case 'one-time':
			$('#one-time').removeClass('inactive').addClass('active');
			$('#one-time-data').removeClass('hidden').addClass('visible');
			$('#existing-user').removeClass('active');
			$('#existing-user-data').removeClass('visible').addClass('hidden');
			break;

		case 'existing-user':
			$('#one-time').removeClass('active');
			$('#one-time-data').removeClass('visible').addClass('hidden');
			$('#existing-user').removeClass('inactive').addClass('active');
			$('#existing-user-data').removeClass('hidden').addClass('visible');
			break;
	}
}

function showText(obj, text) {

  if (obj.value=='') obj.value=text;
}

function hideText(obj, text) {

  if (obj.value==text) obj.value='';
}

function plus(id) {

  number = document.getElementById(id).value;
  number++;

  if (isNaN(number))
    document.getElementById(id).value = '1';
  else
    document.getElementById(id).value = number;

}

function minus(id) {

  number = document.getElementById(id).value;
  if(number != 1)
    number--;

  if (isNaN(number))
    document.getElementById(id).value = '1';
  else
    document.getElementById(id).value = number;
}