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    Julien, yes I understand you. I only give you help.
    I can't do this for you.
    You need to change the class in phtml and then create the same name class in style.css.
    For EXAMPLE:

    <div class="account-menu">
    	<li style="background-position: right -31px"><a class="background-position: right -31px;" href="/rugby/"><span style="background-position: right -31px;">Portail Rugby !</spam></a></li>
    	<li class="welcome">Boutique de Rugby J3SPORT :</li>
    	<li class="YOURNEWCLASS"><a href=""><span>Mon compte</span></a></li>
       <li class="last"><a href=""><span>Log in</span></a></li> </ul>
    .account-menu ul li.YOURNEWCLASS {
    background:transparent url(../images/buttons/YOURIMAGE.png) no-repeat scroll left top;
    padding:0 0 0 15px;

    Hope it helps.