Adding background image to button using CSS (jsfiddle)
===

I am trying to add a background image to a button (or link with the same class) which already has a background color. 

Here is the jsfiddle: http://jsfiddle.net/BNvke/

The button looks great by itself, but I am trying to make it so that if I add a certain class, the padding will be adjusted and a background image will be displayed, however the image does not show. Here is the CSS/HTML:

    .button {
    padding: 10px; 
    margin-right: 8px;
    margin-bottom:10px;
    font-family: Arial, Tahoma, Verdana, FreeSans, sans-serif;
    text-shadow:0 1px 1px rgba(0, 0, 0, 0.25);
    display: inline-block;
    white-space: nowrap;
    line-height:1em;
    position:relative;
    outline: none;
    overflow: visible;
    cursor: pointer;
    border-radius: 4px;
    -moz-border-radius: 4px; 
    -webkit-border-radius:4px; 
    box-shadow:1px 1px 2px 0 #CCCCCC;
    -moz-box-shadow: 1px 1px 2px 0 #CCCCCC;
    -webkit-box-shadow: 1px 1px 2px 0 #CCCCCC;
    }

    .button_blue {
    border: 1px solid #305875;
    color: #FBFBFB;
    background-color: #3D6E97;
    }

    .button_blue:hover {
    color: #FBFBFB;
    opacity:0.9; 
    filter:alpha(opacity=90);        
    }

    .button_about { 
    background-image: url(http://i47.tinypic.com/2ni0ahd.png) 3px 5px no-repeat;
    padding-left: 35px;
    padding-right: 15px;
    }​

-

    <p><a class="button button_blue">Without Background</a></p>

    <p><a class="button button_blue button_about">With Background</a></p>​

How can I get that background image to show?