#pasta{
 height:18px;
 width:18px;
 background-image:url(img/folder.svg);
}

#doc{
 height:18px;
 width:18px;
 background-image:url(img/page.gif);
}

#pdf{
 height:18px;
 width:18px;
 background-image:url(img/icoPDF.svg);
}

#pasta_op{
 height:18px;
 width:18px;
 align:center;
 background-image:url(img/folderopen.gif);
}