This jQuery Plugin allows you to use the HTML5 placeholder feature in all browsers. In case the browser supports it natively this plugin won't do anything.

Usage

HTML

<input name="email" type="text" placeholder="Your email here" />

CSS

input.placeholder{
  color: #cccccc;
}

jQuery

$(document).ready(function(){
  $('input[placeholder]').placeholder();
});

Demo

You can find a demo and an explanation (in spanish, sorry) of the plugin in the next link:

http://theproc.es/2010/3/17/15907/atributo-placeholder-en-todos-los-navegadores