CSS Setting an anchor img source
Say I have a link as follows :

                    <a class="addthis_button_facebook"></a>

Is it possible in css to set the img attribute of this a link so in the end would look like :

    <a class="addthis_button_facebook"><img src="twitter.png" /></a>

Like I tried

a img {
   background-color: black;
}

but no joy
CSS Setting an anchor img source
===

Say I have a link as follows :

                    <a class="addthis_button_facebook"></a>

Is it possible in css to set the img attribute of this a link so in the end would look like :

    <a class="addthis_button_facebook"><img src="twitter.png" /></a>

Like I tried

a img {
   background-color: black;
}

but no joy