div#navTree.accordion li#nav-menu-item-analyse-logs > a:before { background-image:url(../images/logs_nav.png); }

div#navTree.accordion li#nav-menu-item-analyse-logs-transform-rdf > a:before { background-image:url(../images/logs_nav.png); }

.analyse-logs-btn , .analyse-logs-transform-rdf-btn{
    background: url(../images/logs.png) no-repeat center center;
}