// Script by Drew Noakes
// http://drewnoakes.com
// 14 Dec 2006 - Initial release
// 08 Jun 2010 - Added support for password textboxes

var HintClass = "hintTextbox";
var HintActiveClass = "hintTextboxActive";

// define a custom method on the string class to trim leading and training spaces
String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g, ''); };

function initHintTextboxes()
{
  var inputs = document.getElementsByTagName('input');

  for (i = 0; i < inputs.length; i++)
  {
    var input = inputs[i];

    if (input.type!="text" && input.type!="password")
      continue;

    if (input.className.indexOf(HintClass)!=-1)
    {
      if (input.value.trim().length == 0)
      {
        input.value = input.alt;
        input.className = HintClass;
      }
      else
        input.className = HintActiveClass;

      input.onfocus = onHintTextboxFocus;
      input.onblur = onHintTextboxBlur;
    }
  }
}

function onHintTextboxFocus()
{
  var input = this;

  if (input.value.trim() == input.alt)
  {
    input.value = "";
    input.className = HintActiveClass;
  }
}

function onHintTextboxBlur()
{
  var input = this;

  if (input.value.trim().length == 0)
  {
    input.value = input.alt;
    input.className = HintClass;
  }
}

window.onload = initHintTextboxes;