Use Bootstrap .add-on styles to associate an icon with an input element

bootstrap-add-on

<!--
  If pictures are worth a thousand words, here's a spiffy way to associate
  icons with your input elements.

  Use it.  It's pretty.

  For detailed examples and images, see:
    http://twitter.github.com/bootstrap/base-css.html#forms
-->

<!--
  Before...
-->
<div class="input-prepend">
  <span class="add-on">
    <i class="icon icon-search"></i>
  </span>
  <input type="text"/>
</div>

<!--
  ...and after
-->
<div class="input-append">
  <input type="text">
  <span class="add-on">
    <i class="icon icon-search"></i>
  </span>
</div>